Regular expression for matching HH:MM time format

Question

I want a regexp for matching time in HH:MM format. Here\'s what I have, and it works:

^[0-2][0-3]:[0-5][0-9]$

This matches everything from

Answer 1

You can try the following

^\d{1,2}([:.]?\d{1,2})?([ ]?[a|p]m)?$

It can detect the following patterns :

2300 
23:00 
4 am 
4am 
4pm 
4 pm
04:30pm 
04:30 pm 
4:30pm 
4:30 pm
04.30pm
04.30 pm
4.30pm
4.30 pm
23:59 
0000 
00:00

Answer 2

check this masterfull timestamp detector regex I built to look for a user-specified timestamp, examples of what it will pickup include, but is most definitely NOT limited to;

8:30-9:40
09:40-09 : 50
09 : 40-09 : 50
09:40 - 09 : 50
08:00to05:00
08 : 00to05 : 00
08:00 to 05:00
8am-09pm
08h00 till 17h00
8pm-5am
08h00,21h00
06pm untill 9am

It'll also pickup many more, as long as the times include digits

Answer 3

The best would be for HH:MM without taking any risk.

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

Answer 4

Regular Expressions for Time

• HH:MM 12-hour format, optional leading 0

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

• HH:MM 12-hour format, optional leading 0, mandatory meridiems (AM/PM)

    /((1[0-2]|0?[1-9]):([0-5][0-9]) ?([AaPp][Mm]))/
  

• HH:MM 24-hour with leading 0

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

• HH:MM 24-hour format, optional leading 0

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

• HH:MM:SS 24-hour format with leading 0

   /(?:[01]\d|2[0-3]):(?:[0-5]\d):(?:[0-5]\d)/
  

Reference and Demo

Answer 5

Matches:

2:9
2:09
2:59
02:9
02:09
02:59
23:59

Use it:

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

Answer 6

Your original regular expression has flaws: it wouldn't match 04:00 for example.

This may work better:

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