Javascript: Regular expression for time format HH:MM

Question

Hi I want to validate a string to check f it has valid time format. HH:MM However,(due to some insane business reasons) I also want to validate 24:00 as correct.

The following works {([0[0-9]|1[0-9]|2[0-3]):[0-5][0-9]} but does not validate 24:00.

Answer 1

Just change 2[0-3] to 2[0-4]:

^([0[0-9]|1[0-9]|2[0-4]):[0-5][0-9]$

Or if you only want to include 24:00:

^((([0[0-9]|1[0-9]|2[0-3]):[0-5][0-9])|(24:00))$