How do you change date / time with a string?

I'm making a program that involves letting the user change the time manually. They enter the date or time in the textbox and press the command button. I can't get this to work because the DATE and TIME use the long format and the textbox uses strings. I get an error like
"#9:00:00 PM#" (INVALID FORMAT) or something. I believe it is because of the quotes ("") due to the textbox strings. How do you convert long to string, or fix this problem? Thanks.

Use the CDate function.

Thanks a lot. I really needed to know that.