.NET Regular expression for time 24 hr format

Question

Hi,

Can I please have a regular expression in .NET, which will allow only 24 hr time format in the textbox.

Thanks.

Best Regards, MS

Answer 1

Try this

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

It's 24 hour time with optional seconds. (Source)

Answer 2

Regular Expressions: Time hh:mm validation 24 hours format:

([0-1]\d|2[0-3]):([0-5]\d)

If you need seconds too:

([0-1]\d|2[0-3]):([0-5]\d)(:([0-5]\d))?

Edit: To prevent trailing AM/PM, partial match can't be allowed or you have to put the expression between ^ and $.

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

Answer 3

What about using DatePicker or DateTimePicker depending upon if you're using WPF or Winforms? This might be a better UE anyways.

Answer 4

Try

^([0-1]?\d|2[0-3])(:[0-5]\d){1,2}$

Answer 5

I would suggest you take a look at The Regulator for next time when you need a regular expression, its a great tool for designing your expressions.

Answer 6

Personally, rather than go the validation route I would use a control like a datetime picker for the following reasons:

• Zero validation is required. In fact the only validation you'd do would be business rules validation e.g. Order date cannot be later than today, etc
• Easier on the user -- you don't have to tell the user to key in the time in 24 hour format