Get number of days in month in JavaScript

[Marius]

Hello
I want to make a calendar, but I don't know how to calculate the number of days in month, in any year.
How can I get the number of days in any month in a year, taking into account leap years?

Hello
You can use the daysInMonth() function from this example (month is 1 based):

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//Returns the number of days in a given month (1 - 12) and year
function daysInMonth(month, year){
  return month == 2 ? (year %4 ? 28 : (year %100 ? 29 : (year %400 ? 28 :29))) : ((month -1) %7% 2 ? 30 :31);
}
var nr_days = daysInMonth(2, 2016);
alert(nr_days);  // 29

- If someone needs, in PHP there is the cal_days_in_month() function.

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$nr_days = cal_days_in_month(CAL_GREGORIAN, 8, 2003); // 31