Checks if date1 is before date2.
Signature
isBefore(string | number | Date date1, string | number | Date date2, string unit)
Parameters
date1: Type: string | number | Date. A datetime string in ISO8601 format, or a timestamp in milliseconds, or a Date object.
date2: Type: string | number | Date. A datetime string in ISO8601 format, or a timestamp in milliseconds, or a Date object.
unit: Type: string. A datetime unit. Options are 'year', 'month', 'week', 'day', 'hour', 'minute', 'second', or 'millisecond'.
Returns
Type: boolean
Returns true if date1 is before date2, or false otherwise.
Sample Code
var date = new Date();
var day = $A.localizationService.endOf(date, 'day');
// Returns true, since date is before day
$A.localizationService.isBefore(date, day);