Batch File Help

I need to create a batch file that will change the time in numerous text files. The time needs to be changed to 10:00. However, all the original times are different in the text files. Here's an example:

change events.txt "11:00 SETSUBMENUITEM 100 22 1651 0" "10:00 SETSUBMENUITEM 100 22 1650 0"

Instead of entering 11:00, I need to enter something that will cover all times. I know the date can be entered as %yy%%mm%%dd% but I'm not sure about the time.