firstDayInWeek

A function which returns the first date of the current week.

firstDayInWeek(new Date(2016, 0, 15)); // 2016-01-10
firstDayInWeek(new Date(2016, 0, 15), Day.Monday); // 2016-01-11

Parameters

date Date

The initial date.

weekStartDay Day

The first day of the week.

Returns

Date - The first date of the current week.

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