a4a7efaf5f
Previously, we were incorrectly assuming that the daylight global variable indicated whether the current time zone is in DST. In reality, the daylight variable only indicates whether a time zone *can* be in DST. Instead, the tm structure has a tm_isdst member that should be used for this purpose. Ensure our LibC handles tm_isdst, and avoid errant usage of the daylight variable in Core::DateTime.
536 lines
16 KiB
C++
536 lines
16 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/CharacterTypes.h>
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#include <AK/DateConstants.h>
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#include <AK/StringBuilder.h>
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#include <AK/Time.h>
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#include <LibCore/DateTime.h>
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#include <errno.h>
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#include <time.h>
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namespace Core {
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DateTime DateTime::now()
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{
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return from_timestamp(time(nullptr));
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}
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DateTime DateTime::create(int year, int month, int day, int hour, int minute, int second)
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{
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DateTime dt;
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dt.set_time(year, month, day, hour, minute, second);
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return dt;
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}
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DateTime DateTime::from_timestamp(time_t timestamp)
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{
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struct tm tm;
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localtime_r(×tamp, &tm);
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DateTime dt;
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dt.m_year = tm.tm_year + 1900;
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dt.m_month = tm.tm_mon + 1;
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dt.m_day = tm.tm_mday;
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dt.m_hour = tm.tm_hour;
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dt.m_minute = tm.tm_min;
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dt.m_second = tm.tm_sec;
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dt.m_timestamp = timestamp;
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return dt;
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}
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unsigned DateTime::weekday() const
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{
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return ::day_of_week(m_year, m_month, m_day);
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}
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unsigned DateTime::days_in_month() const
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{
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return ::days_in_month(m_year, m_month);
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}
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unsigned DateTime::day_of_year() const
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{
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return ::day_of_year(m_year, m_month, m_day);
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}
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bool DateTime::is_leap_year() const
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{
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return ::is_leap_year(m_year);
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}
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void DateTime::set_time(int year, int month, int day, int hour, int minute, int second)
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{
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struct tm tm = {};
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tm.tm_sec = second;
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tm.tm_min = minute;
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tm.tm_hour = hour;
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tm.tm_mday = day;
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tm.tm_mon = month - 1;
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tm.tm_year = year - 1900;
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tm.tm_isdst = -1;
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// mktime() doesn't read tm.tm_wday and tm.tm_yday, no need to fill them in.
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m_timestamp = mktime(&tm);
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// mktime() normalizes the components to the right ranges (Jan 32 -> Feb 1 etc), so read fields back out from tm.
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m_year = tm.tm_year + 1900;
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m_month = tm.tm_mon + 1;
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m_day = tm.tm_mday;
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m_hour = tm.tm_hour;
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m_minute = tm.tm_min;
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m_second = tm.tm_sec;
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}
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String DateTime::to_string(StringView format) const
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{
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struct tm tm;
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localtime_r(&m_timestamp, &tm);
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StringBuilder builder;
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int const format_len = format.length();
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auto format_time_zone_offset = [&](bool with_separator) {
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struct tm gmt_tm;
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gmtime_r(&m_timestamp, &gmt_tm);
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gmt_tm.tm_isdst = -1;
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auto gmt_timestamp = mktime(&gmt_tm);
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auto offset_seconds = static_cast<time_t>(difftime(m_timestamp, gmt_timestamp));
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StringView offset_sign;
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if (offset_seconds >= 0) {
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offset_sign = "+"sv;
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} else {
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offset_sign = "-"sv;
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offset_seconds *= -1;
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}
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auto offset_hours = offset_seconds / 3600;
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auto offset_minutes = (offset_seconds % 3600) / 60;
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auto separator = with_separator ? ":"sv : ""sv;
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builder.appendff("{}{:02}{}{:02}", offset_sign, offset_hours, separator, offset_minutes);
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};
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for (int i = 0; i < format_len; ++i) {
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if (format[i] != '%') {
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builder.append(format[i]);
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} else {
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if (++i == format_len)
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return String();
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switch (format[i]) {
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case 'a':
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builder.append(short_day_names[tm.tm_wday]);
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break;
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case 'A':
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builder.append(long_day_names[tm.tm_wday]);
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break;
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case 'b':
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builder.append(short_month_names[tm.tm_mon]);
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break;
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case 'B':
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builder.append(long_month_names[tm.tm_mon]);
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break;
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case 'C':
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builder.appendff("{:02}", (tm.tm_year + 1900) / 100);
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break;
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case 'd':
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builder.appendff("{:02}", tm.tm_mday);
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break;
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case 'D':
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builder.appendff("{:02}/{:02}/{:02}", tm.tm_mon + 1, tm.tm_mday, (tm.tm_year + 1900) % 100);
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break;
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case 'e':
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builder.appendff("{:2}", tm.tm_mday);
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break;
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case 'h':
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builder.append(short_month_names[tm.tm_mon]);
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break;
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case 'H':
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builder.appendff("{:02}", tm.tm_hour);
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break;
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case 'I': {
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int display_hour = tm.tm_hour % 12;
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if (display_hour == 0)
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display_hour = 12;
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builder.appendff("{:02}", display_hour);
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break;
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}
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case 'j':
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builder.appendff("{:03}", tm.tm_yday + 1);
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break;
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case 'm':
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builder.appendff("{:02}", tm.tm_mon + 1);
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break;
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case 'M':
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builder.appendff("{:02}", tm.tm_min);
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break;
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case 'n':
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builder.append('\n');
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break;
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case 'p':
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builder.append(tm.tm_hour < 12 ? "AM"sv : "PM"sv);
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break;
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case 'r': {
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int display_hour = tm.tm_hour % 12;
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if (display_hour == 0)
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display_hour = 12;
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builder.appendff("{:02}:{:02}:{:02} {}", display_hour, tm.tm_min, tm.tm_sec, tm.tm_hour < 12 ? "AM" : "PM");
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break;
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}
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case 'R':
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builder.appendff("{:02}:{:02}", tm.tm_hour, tm.tm_min);
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break;
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case 'S':
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builder.appendff("{:02}", tm.tm_sec);
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break;
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case 't':
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builder.append('\t');
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break;
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case 'T':
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builder.appendff("{:02}:{:02}:{:02}", tm.tm_hour, tm.tm_min, tm.tm_sec);
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break;
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case 'u':
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builder.appendff("{}", tm.tm_wday ? tm.tm_wday : 7);
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break;
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case 'U': {
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int const wday_of_year_beginning = (tm.tm_wday + 6 * tm.tm_yday) % 7;
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int const week_number = (tm.tm_yday + wday_of_year_beginning) / 7;
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builder.appendff("{:02}", week_number);
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break;
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}
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case 'V': {
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int const wday_of_year_beginning = (tm.tm_wday + 6 + 6 * tm.tm_yday) % 7;
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int week_number = (tm.tm_yday + wday_of_year_beginning) / 7 + 1;
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if (wday_of_year_beginning > 3) {
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if (tm.tm_yday >= 7 - wday_of_year_beginning)
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--week_number;
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else {
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int const days_of_last_year = days_in_year(tm.tm_year + 1900 - 1);
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int const wday_of_last_year_beginning = (wday_of_year_beginning + 6 * days_of_last_year) % 7;
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week_number = (days_of_last_year + wday_of_last_year_beginning) / 7 + 1;
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if (wday_of_last_year_beginning > 3)
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--week_number;
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}
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}
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builder.appendff("{:02}", week_number);
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break;
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}
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case 'w':
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builder.appendff("{}", tm.tm_wday);
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break;
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case 'W': {
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int const wday_of_year_beginning = (tm.tm_wday + 6 + 6 * tm.tm_yday) % 7;
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int const week_number = (tm.tm_yday + wday_of_year_beginning) / 7;
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builder.appendff("{:02}", week_number);
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break;
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}
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case 'y':
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builder.appendff("{:02}", (tm.tm_year + 1900) % 100);
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break;
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case 'Y':
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builder.appendff("{}", tm.tm_year + 1900);
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break;
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case 'z':
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format_time_zone_offset(false);
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break;
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case ':':
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if (++i == format_len) {
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builder.append("%:"sv);
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break;
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}
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if (format[i] != 'z') {
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builder.append("%:"sv);
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builder.append(format[i]);
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break;
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}
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format_time_zone_offset(true);
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break;
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case 'Z': {
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auto const* timezone_name = tzname[tm.tm_isdst == 0 ? 0 : 1];
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builder.append({ timezone_name, strlen(timezone_name) });
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break;
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}
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case '%':
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builder.append('%');
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break;
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default:
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builder.append('%');
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builder.append(format[i]);
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break;
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}
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}
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}
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return builder.build();
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}
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Optional<DateTime> DateTime::parse(StringView format, String const& string)
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{
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unsigned format_pos = 0;
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unsigned string_pos = 0;
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struct tm tm = {};
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auto parsing_failed = false;
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auto parse_number = [&] {
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if (string_pos >= string.length()) {
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parsing_failed = true;
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return 0;
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}
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char* end_ptr = nullptr;
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errno = 0;
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int number = strtol(string.characters() + string_pos, &end_ptr, 10);
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auto chars_parsed = end_ptr - (string.characters() + string_pos);
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if (chars_parsed == 0 || errno != 0)
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parsing_failed = true;
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else
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string_pos += chars_parsed;
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return number;
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};
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auto consume = [&](char x) {
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if (string_pos >= string.length()) {
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parsing_failed = true;
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return;
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}
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if (string[string_pos] != x)
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parsing_failed = true;
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else
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string_pos++;
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};
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while (format_pos < format.length() && string_pos < string.length()) {
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if (format[format_pos] != '%') {
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if (format[format_pos] != string[string_pos]) {
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return {};
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}
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format_pos++;
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string_pos++;
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continue;
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}
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format_pos++;
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if (format_pos == format.length()) {
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return {};
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}
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switch (format[format_pos]) {
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case 'a': {
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auto wday = 0;
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for (auto name : short_day_names) {
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if (string.substring_view(string_pos).starts_with(name, AK::CaseSensitivity::CaseInsensitive)) {
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string_pos += name.length();
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tm.tm_wday = wday;
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break;
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}
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++wday;
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}
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if (wday == 7)
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return {};
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break;
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}
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case 'A': {
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auto wday = 0;
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for (auto name : long_day_names) {
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if (string.substring_view(string_pos).starts_with(name, AK::CaseSensitivity::CaseInsensitive)) {
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string_pos += name.length();
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tm.tm_wday = wday;
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break;
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}
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++wday;
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}
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if (wday == 7)
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return {};
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break;
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}
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case 'h':
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case 'b': {
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auto mon = 0;
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for (auto name : short_month_names) {
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if (string.substring_view(string_pos).starts_with(name, AK::CaseSensitivity::CaseInsensitive)) {
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string_pos += name.length();
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tm.tm_mon = mon;
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break;
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}
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++mon;
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}
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if (mon == 12)
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return {};
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break;
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}
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case 'B': {
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auto mon = 0;
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for (auto name : long_month_names) {
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if (string.substring_view(string_pos).starts_with(name, AK::CaseSensitivity::CaseInsensitive)) {
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string_pos += name.length();
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tm.tm_mon = mon;
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break;
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}
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++mon;
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}
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if (mon == 12)
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return {};
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break;
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}
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case 'C': {
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int num = parse_number();
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tm.tm_year = (num - 19) * 100;
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break;
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}
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case 'd': {
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tm.tm_mday = parse_number();
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break;
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}
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case 'D': {
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int mon = parse_number();
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consume('/');
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int day = parse_number();
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consume('/');
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int year = parse_number();
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tm.tm_mon = mon + 1;
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tm.tm_mday = day;
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tm.tm_year = (year + 1900) % 100;
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break;
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}
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case 'e': {
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tm.tm_mday = parse_number();
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break;
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}
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case 'H': {
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tm.tm_hour = parse_number();
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break;
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}
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case 'I': {
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int num = parse_number();
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tm.tm_hour = num % 12;
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break;
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}
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case 'j': {
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// a little trickery here... we can get mktime() to figure out mon and mday using out of range values.
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// yday is not used so setting it is pointless.
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tm.tm_mday = parse_number();
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tm.tm_mon = 0;
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mktime(&tm);
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break;
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}
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case 'm': {
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int num = parse_number();
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tm.tm_mon = num - 1;
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break;
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}
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case 'M': {
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tm.tm_min = parse_number();
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break;
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}
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case 'n':
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case 't':
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while (is_ascii_blank(string[string_pos])) {
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string_pos++;
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}
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break;
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case 'p': {
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auto ampm = string.substring_view(string_pos, 2);
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if (ampm == "PM" && tm.tm_hour < 12) {
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tm.tm_hour += 12;
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}
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string_pos += 2;
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break;
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}
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case 'r': {
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auto ampm = string.substring_view(string_pos, 2);
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if (ampm == "PM" && tm.tm_hour < 12) {
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tm.tm_hour += 12;
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}
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string_pos += 2;
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break;
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}
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case 'R': {
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tm.tm_hour = parse_number();
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consume(':');
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tm.tm_min = parse_number();
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break;
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}
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case 'S':
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tm.tm_sec = parse_number();
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break;
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case 'T':
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tm.tm_hour = parse_number();
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consume(':');
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tm.tm_min = parse_number();
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consume(':');
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tm.tm_sec = parse_number();
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break;
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case 'w':
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tm.tm_wday = parse_number();
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break;
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case 'y': {
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int year = parse_number();
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tm.tm_year = year <= 99 && year > 69 ? 1900 + year : 2000 + year;
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break;
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}
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case 'Y': {
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int year = parse_number();
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tm.tm_year = year - 1900;
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break;
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}
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case 'z': {
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if (string[string_pos] == 'Z') {
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// UTC time
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string_pos++;
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break;
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}
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int sign;
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if (string[string_pos] == '+')
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sign = -1;
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else if (string[string_pos] == '-')
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sign = +1;
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else
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return {};
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string_pos++;
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auto hours = parse_number();
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int minutes;
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if (string_pos < string.length() && string[string_pos] == ':') {
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string_pos++;
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minutes = parse_number();
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} else {
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minutes = hours % 100;
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hours = hours / 100;
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}
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tm.tm_hour += sign * hours;
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tm.tm_min += sign * minutes;
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break;
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}
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case '%':
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if (string[string_pos] != '%') {
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return {};
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}
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string_pos += 1;
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break;
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default:
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parsing_failed = true;
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break;
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}
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if (parsing_failed) {
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return {};
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}
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format_pos++;
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}
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if (string_pos != string.length() || format_pos != format.length()) {
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return {};
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}
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return DateTime::from_timestamp(mktime(&tm));
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}
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}
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