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first pass of the greg to unity conversion

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Effie 2024-06-11 19:20:34 +10:00
parent e4917f8cea
commit 0188404198
1 changed files with 44 additions and 13 deletions
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55
assets/unitymath.js
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@ -17,7 +17,11 @@ const monthdays = 30
const leapfreq = 8 const leapfreq = 8
const exleapcyclelength = 800; const exleapcyclelength = 800;
const extraleapyear = 500; const exleapyear = 500;
const exleapyearlowbound = Math.floor(exleapyear / leapfreq) * leapfreq;
const exleapyearupbound = exleapyearlowbound + leapfreq;
const exleapyearlowbounddays = (exleapyearlowbound * yeardays) + ((exleapyearlowbound / leapfreq) * leapchange);
const exleapyearupbounddays = (exleapyearupbound * yeardays) + leapchange + ((exleapyearupbound / leapfreq) * leapchange);
const exleapcycledays = (exleapcyclelength * yeardays) + leapchange + ((exleapcyclelength / leapfreq) * leapchange) const exleapcycledays = (exleapcyclelength * yeardays) + leapchange + ((exleapcyclelength / leapfreq) * leapchange)
@ -33,28 +37,50 @@ function unixtounity(unixtime) {
const exleapcycleprogress = days - exleapcycles * exleapcycledays; const exleapcycleprogress = days - exleapcycles * exleapcycledays;
const leapcycles = Math.floor(exleapcycleprogress / leapcycledays); let leapcycles;
const leapcycleprogress = exleapcycleprogress - leapcycles * leapcycledays; let leapcycleprogress;
let years; let leapcyclehasex;
let yearprogress; if (exleapcycleprogress < exleapyearupbounddays) {
if (leapcycleprogress > leapyeardays) { leapcycles = Math.floor(exleapcycleprogress / leapcycledays);
years = Math.floor((leapcycleprogress - leapyeardays) / yeardays) + 1; leapcycleprogress = exleapcycleprogress - leapcycles * leapcycledays;
yearprogress = leapcycleprogress - ((years * yeardays) + leapchange); leapcyclehasex = exleapcycleprogress >= exleapyearlowbounddays;
} else { } else {
years = 0; leapcycles = Math.floor((exleapcycleprogress - leapchange)/ leapcycledays);
yearprogress = leapcycleprogress; leapcycleprogress = (exleapcycleprogress - (leapcycles * leapcycledays)) - leapchange;
leapcyclehasex = false;
} }
let leapyearspassed;
if (leapcycleprogress < leapyeardays) {
leapyearspassed = 0;
} else if (!leapcyclehasex || leapcycleprogress < (2 * leapyeardays) + (3 * yeardays)) {
leapyearspassed = 1;
} else {
leapyearspassed = 2;
}
const years = Math.floor((leapcycleprogress - (leapchange * leapyearspassed)) / yeardays);
const yearprogress = leapcycleprogress - ((years * yeardays) + (leapchange * leapyearspassed));
const months = Math.floor(yearprogress / monthdays); const months = Math.floor(yearprogress / monthdays);
const monthprogress = yearprogress - months * monthdays; const monthprogress = yearprogress - months * monthdays;
@ -69,6 +95,11 @@ const oldtimes = new Date();
oldtimes.setYear(-600) oldtimes.setYear(-600)
console.log(unixtounity(Date.now())) console.log(unixtounity(Date.now()))
console.log(unixtounity(Date.parse("3500-03-03")))
console.log(unixtounity(Date.parse("0010-12-30")))
console.log(unixtounity(oldtimes.getTime())) console.log(unixtounity(oldtimes.getTime()))
console.log(unixtounity(Date.parse("2000-01-01")))
console.log(unixtounity(Date.parse("2000-03-07")))
console.log(unixtounity(Date.parse("2000-03-08")))
console.log(unixtounity(Date.parse("2000-03-09")))
console.log(unixtounity(Date.parse("2001-03-07")))
console.log(unixtounity(Date.parse("3000-03-07")))
console.log(unixtounity(Date.parse("42400-03-07")))