check format of date with moment.js

Question

I am taking input from calendar in my screen which is of this type

DD-MMM-YYYY HH:mm a

but user can provide date from keyboard. Now I have to

Answer 1

If you don't have a particular date format then you can also use Array of formats,

moment(checked_date, [DATE_FORMAT1, DATE_FORMAT2]).format(DATE_FORMAT)
 === checked_date

Answer 2

This is much better:

if (!moment(checked_date, DATE_FORMAT).isValid()) throw Error(Argument passed is invalid: checked_date. Date format must be ${DATE_FORMAT});

Answer 3

if it's just for checking the below is a better alternative

moment(scope.modelValue, 'DD-MMM-YYYY HH:mm a', true).isValid()

Answer 4

For checking date format you could use:

moment(checked_date, DATE_FORMAT).format(DATE_FORMAT) === checked_date