How do it force a user to enter a time in a date time field??

I am new to live cycle, not to acrobat pro. I must say live cycle is pretty cool and i may just switch to live cycle forever...
But i can not figure this out. I have a HR form. I need to make the time of occurence field, required, validate and wont let you move on until you enter a time.
Right now it functions as required, it shows a custom message, but the user can enter garbage text and skip through. How do i set up this field where the user can only enter a time and not skip through??
I am sure this is rather easy, i just dont know where to start.. Thanks in Advance

Hi Paul:
That completely makes sense... Only problem what would or could the javascript be??
I have already inserted some for the save as and print buttons sucessfully
BTW in my form the time/date field is selected and to format to show time only. In my other date fields is does show a calendar after you hit the little arrow and the user can still insert garbage.
What i would ultimately want is for the user not to insert garbage and forcing them to insert a time in the time field.
It is possible that i forgot or missed a step being as im new to Live Cycle.

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* Filename:           JSMaskedTextField.java
* Creation date:      22-mei-2004
* Author:                Kevin Pors
package jsupport.swingext;
import java.awt.event.KeyEvent;
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