Nop, it doesn't work. Probably this can help you:
If I enter a static date value with the Validate Time "checked", the validation fails. It only works with the Validate Time option "unchecked". The WebAssist Help System mentions that in some instances both check boxes should be selected. Obviously, everything that I try, I check it both ways. Probably the script is having problems validating this mktime function. I look at it and everything seems ok to me. I have no idea. Please advise...