irkreja
/ JavaScript function to get ISO-8601 week number (01-53) of year, weeks starting on Monday
Created
May 21, 2020 10:41
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| function ISO8601_week_no(dt) | |
| { | |
| var tdt = new Date(dt.valueOf()); | |
| var dayn = (dt.getDay() + 6) % 7; | |
| tdt.setDate(tdt.getDate() - dayn + 3); | |
| var firstThursday = tdt.valueOf(); | |
| tdt.setMonth(0, 1); | |
| if (tdt.getDay() !== 4) | |
| { | |
| tdt.setMonth(0, 1 + ((4 - tdt.getDay()) + 7) % 7); |
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