PHP? ??('W')? ????? JavaScript?? ? ?? ????
PHP? ??('W') ??? ?? ISO-8601 ? ??? ?????. ????? ?????. ?? ?? ??? ???? JavaScript?? ??? ??? ?? ? ????.
?? ????? ??
?? ???? ?? ??? ?? ?????? ???? ISO ?? ??? ? ????. ?? ??? ?:
??? ?? JavaScript ??
?? ??? ?? JavaScript ??? ???? ?? ??? ? ????. ??:
/* For a given date, get the ISO week number
*
* Based on information at:
*
* THIS PAGE (DOMAIN EVEN) DOESN'T EXIST ANYMORE UNFORTUNATELY
* http://www.merlyn.demon.co.uk/weekcalc.htm#WNR
*
* Algorithm is to find nearest thursday, it's year
* is the year of the week number. Then get weeks
* between that date and the first day of that year.
*
* Note that dates in one year can be weeks of previous
* or next year, overlap is up to 3 days.
*
* e.g. 2014/12/29 is Monday in week 1 of 2015
* 2012/1/1 is Sunday in week 52 of 2011
*/
function getWeekNumber(d) {
// Copy date so don't modify original
d = new Date(Date.UTC(d.getFullYear(), d.getMonth(), d.getDate()));
// Set to nearest Thursday: current date + 4 - current day number
// Make Sunday's day number 7
d.setUTCDate(d.getUTCDate() + 4 - (d.getUTCDay()||7));
// Get first day of year
var yearStart = new Date(Date.UTC(d.getUTCFullYear(),0,1));
// Calculate full weeks to nearest Thursday
var weekNo = Math.ceil(( ( (d - yearStart) / 86400000) + 1)/7);
// Return array of year and week number
return [d.getUTCFullYear(), weekNo];
}
var result = getWeekNumber(new Date());
document.write('It\'s currently week ' + result[1] + ' of ' + result[0]);
??
var date = new Date("2018-01-15");
var weekNumber = getWeekNumber(date);
console.log(weekNumber[1]); // Output: 3? ??? JavaScript? ISO ? ??? ?? ??? ??????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!
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