Help!!How to judge if a string is a time string?

[xmasry]

When I manage my file, I need to judge a string(or some chars) read from the file is a time expression or not? Such as:
00:00:00.18,00:00:00.71.
I need to recognize that the 00:00:00.18 expression is a time.
thanks!

[RickCrone]

Maybe parse the string into a COleDatetime... if it fails to parse it's not a date time.