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LibCore: Moved cal.cpp functions to DateTime

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rhin123 2020-03-10 16:41:01 -05:00 • committed by Andreas Kling
parent 46a897b59b
commit 08a30a4961
3 changed files with 75 additions and 23 deletions
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65
Libraries/LibCore/DateTime.cpp
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@ -36,6 +36,22 @@ 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.m_year = year;
dt.m_month = month;
dt.m_day = day;
dt.m_hour = hour;
dt.m_minute = minute;
dt.m_second = second;
struct tm tm = { (int)second, (int)minute, (int)hour, (int)day, (int)month, (int)year, (int)dt.weekday(), (int)dt.day_of_year(), -1 };
dt.m_timestamp = mktime(&tm);
return dt;
}
DateTime DateTime::from_timestamp(time_t timestamp)
{
struct tm tm;
@ -51,6 +67,55 @@ DateTime DateTime::from_timestamp(time_t timestamp)
return dt;
}
unsigned DateTime::weekday() const
{
int target_year = m_year;
static const int seek_table[] = { 0, 3, 2, 5, 0, 3, 5, 1, 4, 6, 2, 4 };
if (m_month < 3)
--target_year;
return (target_year + target_year / 4 - target_year / 100 + target_year / 400 + seek_table[m_month - 1] + m_day) % 7;
}
unsigned DateTime::days_in_month() const
{
bool is_long_month = (m_month == 1 || m_month == 3 || m_month == 5 || m_month == 7 || m_month == 8 || m_month == 10 || m_month == 12);
if (m_month == 2)
return is_leap_year() ? 29 : 28;
return is_long_month ? 31 : 30;
}
unsigned DateTime::day_of_year() const
{
static const int seek_table[] = { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 };
int day_of_year = seek_table[m_month - 1] + m_day;
if (is_leap_year() && m_month > 3)
day_of_year++;
return day_of_year - 1;
}
bool DateTime::is_leap_year() const
{
return ((m_year % 400 == 0) || (m_year % 4 == 0 && m_year % 100 != 0));
}
void DateTime::set_time(unsigned year, unsigned month, unsigned day, unsigned hour, unsigned minute, unsigned second)
{
m_year = year;
m_month = month;
m_day = day;
m_hour = hour;
m_minute = minute;
m_second = second;
struct tm tm = { (int)second, (int)minute, (int)hour, (int)day, (int)month, (int)year, (int)weekday(), (int)day_of_year(), -1 };
m_timestamp = mktime(&tm);
}
String DateTime::to_string(const String& format) const
{