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Fix basedate calculation

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Correct numdate / datenum calculation to eliminate problems
with timezones that equal nowadays but were different
in the past (e.g. Europe/Minsk and Europe/Moscow)
This commit is contained in:
Ivan Trusov 2022-05-13 11:00:36 +03:00
parent e43071fc64
commit c14e1712ea
1 changed files with 6 additions and 3 deletions
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xlsx.js generated
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@ -3214,16 +3214,19 @@ function evert_arr(obj) {
return o;
}
var basedate = new Date(1899, 11, 30, 0, 0, 0); // 2209161600000
var basedate = new Date(); // 2209161600000
basedate.setUTCFullYear(1899, 11, 30);
basedate.setUTCHours(0, 0, 0);
function datenum(v, date1904) {
var epoch = v.getTime();
if(date1904) epoch -= 1462*24*60*60*1000;
var dnthresh = basedate.getTime() + (v.getTimezoneOffset() - basedate.getTimezoneOffset()) * 60000;
var dnthresh = basedate.getTime() + v.getTimezoneOffset() * 60000;
return (epoch - dnthresh) / (24 * 60 * 60 * 1000);
}
var refdate = new Date();
var dnthresh = basedate.getTime() + (refdate.getTimezoneOffset() - basedate.getTimezoneOffset()) * 60000;
var refoffset = refdate.getTimezoneOffset();
var dnthresh = basedate.getTime() + refoffset * 60000;
function numdate(v) {
var out = new Date();
out.setTime(v * 24 * 60 * 60 * 1000 + dnthresh);