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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/StringBuilder.h>
#include <AK/Time.h>
#include <LibCore/DateTime.h>
#include <sys/time.h>
#include <time.h>
namespace Core {
DateTime DateTime::now()
{
return from_timestamp(time(nullptr));
}
DateTime DateTime::create(unsigned year, unsigned month, unsigned day, unsigned hour, unsigned minute, unsigned second)
{
DateTime dt;
dt.set_time(year, month, day, hour, minute, second);
return dt;
}
DateTime DateTime::from_timestamp(time_t timestamp)
{
struct tm tm;
localtime_r(×tamp, &tm);
DateTime dt;
dt.m_year = tm.tm_year + 1900;
dt.m_month = tm.tm_mon + 1;
dt.m_day = tm.tm_mday;
dt.m_hour = tm.tm_hour;
dt.m_minute = tm.tm_min;
dt.m_second = tm.tm_sec;
dt.m_timestamp = timestamp;
return dt;
}
unsigned DateTime::weekday() const
{
return ::day_of_week(m_year, m_month, m_day);
}
unsigned DateTime::days_in_month() const
{
return ::days_in_month(m_year, m_month);
}
unsigned DateTime::day_of_year() const
{
return ::day_of_year(m_year, m_month, m_day);
}
bool DateTime::is_leap_year() const
{
return ::is_leap_year(m_year);
}
void DateTime::set_time(unsigned year, unsigned month, unsigned day, unsigned hour, unsigned minute, unsigned second)
{
struct tm tm = {};
tm.tm_sec = (int)second;
tm.tm_min = (int)minute;
tm.tm_hour = (int)hour;
tm.tm_mday = (int)day;
tm.tm_mon = (int)month - 1;
tm.tm_year = (int)year - 1900;
tm.tm_isdst = -1;
// mktime() doesn't read tm.tm_wday and tm.tm_yday, no need to fill them in.
m_timestamp = mktime(&tm);
// mktime() normalizes the components to the right ranges (Jan 32 -> Feb 1 etc), so read fields back out from tm.
m_year = tm.tm_year + 1900;
m_month = tm.tm_mon + 1;
m_day = tm.tm_mday;
m_hour = tm.tm_hour;
m_minute = tm.tm_min;
m_second = tm.tm_sec;
}
String DateTime::to_string(const String& format) const
{
const char wday_short_names[7][4] = {
"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
};
const char wday_long_names[7][10] = {
"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"
};
const char mon_short_names[12][4] = {
"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
};
const char mon_long_names[12][10] = {
"January", "February", "March", "April", "May", "June",
"July", "August", "September", "October", "November", "December"
};
struct tm tm;
localtime_r(&m_timestamp, &tm);
StringBuilder builder;
const int format_len = format.length();
for (int i = 0; i < format_len; ++i) {
if (format[i] != '%') {
builder.append(format[i]);
} else {
if (++i == format_len)
return String();
switch (format[i]) {
case 'a':
builder.append(wday_short_names[tm.tm_wday]);
break;
case 'A':
builder.append(wday_long_names[tm.tm_wday]);
break;
case 'b':
builder.append(mon_short_names[tm.tm_mon]);
break;
case 'B':
builder.append(mon_long_names[tm.tm_mon]);
break;
case 'C':
builder.appendff("{:02}", (tm.tm_year + 1900) / 100);
break;
case 'd':
builder.appendff("{:02}", tm.tm_mday);
break;
case 'D':
builder.appendff("{:02}/{:02}/{:02}", tm.tm_mon + 1, tm.tm_mday, (tm.tm_year + 1900) % 100);
break;
case 'e':
builder.appendff("{:2}", tm.tm_mday);
break;
case 'h':
builder.append(mon_short_names[tm.tm_mon]);
break;
case 'H':
builder.appendff("{:02}", tm.tm_hour);
break;
case 'I':
builder.appendff("{:02}", tm.tm_hour % 12);
break;
case 'j':
builder.appendff("{:03}", tm.tm_yday + 1);
break;
case 'm':
builder.appendff("{:02}", tm.tm_mon + 1);
break;
case 'M':
builder.appendff("{:02}", tm.tm_min);
break;
case 'n':
builder.append('\n');
break;
case 'p':
builder.append(tm.tm_hour < 12 ? "a.m." : "p.m.");
break;
case 'r':
builder.appendff("{:02}:{:02}:{:02} {}", tm.tm_hour % 12, tm.tm_min, tm.tm_sec, tm.tm_hour < 12 ? "a.m." : "p.m.");
break;
case 'R':
builder.appendff("{:02}:{:02}", tm.tm_hour, tm.tm_min);
break;
case 'S':
builder.appendff("{:02}", tm.tm_sec);
break;
case 't':
builder.append('\t');
break;
case 'T':
builder.appendff("{:02}:{:02}:{:02}", tm.tm_hour, tm.tm_min, tm.tm_sec);
break;
case 'u':
builder.appendff("{}", tm.tm_wday ? tm.tm_wday : 7);
break;
case 'U': {
const int wday_of_year_beginning = (tm.tm_wday + 6 * tm.tm_yday) % 7;
const int week_number = (tm.tm_yday + wday_of_year_beginning) / 7;
builder.appendff("{:02}", week_number);
break;
}
case 'V': {
const int wday_of_year_beginning = (tm.tm_wday + 6 + 6 * tm.tm_yday) % 7;
int week_number = (tm.tm_yday + wday_of_year_beginning) / 7 + 1;
if (wday_of_year_beginning > 3) {
if (tm.tm_yday >= 7 - wday_of_year_beginning)
--week_number;
else {
const int days_of_last_year = days_in_year(tm.tm_year + 1900 - 1);
const int wday_of_last_year_beginning = (wday_of_year_beginning + 6 * days_of_last_year) % 7;
week_number = (days_of_last_year + wday_of_last_year_beginning) / 7 + 1;
if (wday_of_last_year_beginning > 3)
--week_number;
}
}
builder.appendff("{:02}", week_number);
break;
}
case 'w':
builder.appendff("{}", tm.tm_wday);
break;
case 'W': {
const int wday_of_year_beginning = (tm.tm_wday + 6 + 6 * tm.tm_yday) % 7;
const int week_number = (tm.tm_yday + wday_of_year_beginning) / 7;
builder.appendff("{:02}", week_number);
break;
}
case 'y':
builder.appendff("{:02}", (tm.tm_year + 1900) % 100);
break;
case 'Y':
builder.appendff("{}", tm.tm_year + 1900);
break;
case '%':
builder.append('%');
break;
default:
return String();
}
}
}
return builder.build();
}
}
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