mirror of https://github.com/bsnes-emu/bsnes.git
82 lines
1.8 KiB
C++
82 lines
1.8 KiB
C++
const unsigned SharpRTC::daysinmonth[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
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void SharpRTC::tick_second() {
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if(++second < 60) return;
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second = 0;
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tick_minute();
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}
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void SharpRTC::tick_minute() {
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if(++minute < 60) return;
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minute = 0;
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tick_hour();
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}
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void SharpRTC::tick_hour() {
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if(++hour < 24) return;
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hour = 0;
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tick_day();
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}
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void SharpRTC::tick_day() {
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unsigned days = daysinmonth[month % 12];
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//add one day for leap years
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if(year % 400 == 0) days++;
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else if(year % 100 == 0);
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else if(year % 4 == 0) days++;
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if(day++ < days) return;
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day = 1;
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tick_month();
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}
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void SharpRTC::tick_month() {
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if(month++ < 12) return;
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month = 1;
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tick_year();
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}
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void SharpRTC::tick_year() {
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year++;
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year = (uint12)year;
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}
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//returns day of week for specified date
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//eg 0 = Sunday, 1 = Monday, ... 6 = Saturday
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//usage: calculate_weekday(2008, 1, 1) returns weekday of January 1st, 2008
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unsigned SharpRTC::calculate_weekday(unsigned year, unsigned month, unsigned day) {
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unsigned y = 1000, m = 1; //SharpRTC epoch is 1000-01-01
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unsigned sum = 0; //number of days passed since epoch
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year = max(1000, year);
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month = max(1, min(12, month));
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day = max(1, min(31, day));
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while(y < year) {
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bool leapyear = false;
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if(y % 4 == 0) {
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leapyear = true;
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if(y % 100 == 0 && y % 400 != 0) leapyear = false;
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}
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sum += 365 + leapyear;
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y++;
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}
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while(m < month) {
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unsigned days = daysinmonth[m - 1];
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bool leapyearmonth = false;
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if(days == 28) {
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if(y % 4 == 0) {
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leapyearmonth = true;
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if(y % 100 == 0 && y % 400 != 0) leapyearmonth = false;
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}
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}
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sum += days + leapyearmonth;
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m++;
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}
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sum += day - 1;
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return (sum + 3) % 7; //1000-01-01 was a Wednesday
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}
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