105 lines
3.1 KiB
JavaScript
105 lines
3.1 KiB
JavaScript
const hoursperday = 24
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const minutesperhour = 60
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const secondsperminute = 60
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const secondms = 1000
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const minutems = secondms * secondsperminute
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const hourms = minutems * minutesperhour
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const dayms = hourms * hoursperday
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const solaryear = 365.242
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const yeardays = 366
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const leapchange = -6
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const leapyeardays = yeardays + leapchange
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const monthdays = 30
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const leapfreq = 8
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const exleapcyclelength = 800;
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const exleapyear = 500;
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const exleapyearlowbound = Math.floor(exleapyear / leapfreq) * leapfreq;
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const exleapyearupbound = exleapyearlowbound + leapfreq;
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const exleapyearlowbounddays = (exleapyearlowbound * yeardays) + ((exleapyearlowbound / leapfreq) * leapchange);
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const exleapyearupbounddays = (exleapyearupbound * yeardays) + leapchange + ((exleapyearupbound / leapfreq) * leapchange);
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const exleapcycledays = (exleapcyclelength * yeardays) + leapchange + ((exleapcyclelength / leapfreq) * leapchange)
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const leapcycledays = (leapfreq * yeardays) + leapchange;
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const unityzero = Date.parse("2000-03-08T00:00:00.000Z");
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function unixtounity(unixtime) {
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const unitytime = unixtime - unityzero;
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const days = unitytime / dayms;
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const exleapcycles = Math.floor(days / exleapcycledays);
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const exleapcycleprogress = days - exleapcycles * exleapcycledays;
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let leapcycles;
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let leapcycleprogress;
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let leapcyclehasex;
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if (exleapcycleprogress < exleapyearupbounddays) {
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leapcycles = Math.floor(exleapcycleprogress / leapcycledays);
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leapcycleprogress = exleapcycleprogress - leapcycles * leapcycledays;
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leapcyclehasex = exleapcycleprogress >= exleapyearlowbounddays;
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} else {
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leapcycles = Math.floor((exleapcycleprogress - leapchange)/ leapcycledays);
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leapcycleprogress = (exleapcycleprogress - (leapcycles * leapcycledays)) - leapchange;
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leapcyclehasex = false;
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}
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let leapyearspassed;
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if (leapcycleprogress < leapyeardays) {
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leapyearspassed = 0;
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} else if (!leapcyclehasex || leapcycleprogress < (2 * leapyeardays) + (3 * yeardays)) {
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leapyearspassed = 1;
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} else {
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leapyearspassed = 2;
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}
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const years = Math.floor((leapcycleprogress - (leapchange * leapyearspassed)) / yeardays);
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const yearprogress = leapcycleprogress - ((years * yeardays) + (leapchange * leapyearspassed));
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const months = Math.floor(yearprogress / monthdays);
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const monthprogress = yearprogress - months * monthdays;
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const date = Math.floor(monthprogress);
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return `${12000 + (exleapcycles * exleapcyclelength) + (leapcycles * leapfreq) + years}-${months + 1}-${date + 1}`
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}
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const oldtimes = new Date();
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oldtimes.setYear(-600)
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console.log(unixtounity(Date.now()))
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console.log(unixtounity(oldtimes.getTime()))
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console.log(unixtounity(Date.parse("2000-01-01")))
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console.log(unixtounity(Date.parse("2000-03-07")))
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console.log(unixtounity(Date.parse("2000-03-08")))
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console.log(unixtounity(Date.parse("2000-03-09")))
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console.log(unixtounity(Date.parse("2001-03-07")))
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console.log(unixtounity(Date.parse("3000-03-07")))
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console.log(unixtounity(Date.parse("42400-03-07"))) |