forked from sheetjs/sheetjs
41 lines
1.5 KiB
JavaScript
41 lines
1.5 KiB
JavaScript
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function parse_date_code(v/*:number*/,opts/*:?any*/,b2/*:?boolean*/) {
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if(v > 2958465 || v < 0) return null;
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var date = (v|0), time = Math.floor(86400 * (v - date)), dow=0;
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var dout=[];
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var out={D:date, T:time, u:86400*(v-date)-time,y:0,m:0,d:0,H:0,M:0,S:0,q:0};
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if(Math.abs(out.u) < 1e-6) out.u = 0;
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if(opts && opts.date1904) date += 1462;
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if(out.u > 0.9999) {
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out.u = 0;
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if(++time == 86400) { out.T = time = 0; ++date; ++out.D; }
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}
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if(date === 60) {dout = b2 ? [1317,10,29] : [1900,2,29]; dow=3;}
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else if(date === 0) {dout = b2 ? [1317,8,29] : [1900,1,0]; dow=6;}
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else {
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if(date > 60) --date;
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/* 1 = Jan 1 1900 in Gregorian */
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var d = new Date(1900, 0, 1);
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d.setDate(d.getDate() + date - 1);
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dout = [d.getFullYear(), d.getMonth()+1,d.getDate()];
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dow = d.getDay();
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if(date < 60) dow = (dow + 6) % 7;
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if(b2) dow = fix_hijri(d, dout);
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}
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out.y = dout[0]; out.m = dout[1]; out.d = dout[2];
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out.S = time % 60; time = Math.floor(time / 60);
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out.M = time % 60; time = Math.floor(time / 60);
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out.H = time;
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out.q = dow;
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return out;
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}
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SSF.parse_date_code = parse_date_code;
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var basedate = new Date(1899, 11, 31, 0, 0, 0);
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var dnthresh = basedate.getTime();
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var base1904 = new Date(1900, 2, 1, 0, 0, 0);
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function datenum_local(v/*:Date*/, date1904/*:?boolean*/)/*:number*/ {
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var epoch = v.getTime();
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if(date1904) epoch -= 1461*24*60*60*1000;
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else if(v >= base1904) epoch += 24*60*60*1000;
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return (epoch - (dnthresh + (v.getTimezoneOffset() - basedate.getTimezoneOffset()) * 60000)) / (24 * 60 * 60 * 1000);
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}
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