Why would you not simply use an element bound to a TIME field, and let Sesame take care of it for you.

What are your format settings?

Is the colon not appearing when you leave the element?

Or, is the problem that you would like the colon to appear while you are in the element?

If the former, I'll need more details.

If the latter, then you can use on immediate change programming to insert the colon.

That's because it belives that you are trying to enter 1600 hours (i.e.: 1600:00). If you just type 16 and leave the element, you will get 16:00. If you want to type a number like 1632 and get 16:32, you will need to use SBasic.

That code will work if you change the time field into a string field. If you leave it a time field, the format check will run first and prevent the SBasic code from running (because the data is presumably incorrect for a time field). Or you can use immediate change programming, in which case, no, the code will not work. Ite will need to be rewritten so as to not interfere with the user.

If you do change the field type to string, put the subroutine in Global Code, and call it from On Change or On Exit. Note that your version is using "smart quotes", those will have to be changed to regular double quotes.

Subroutine TimeNumb()
var vStr as string

	vStr = @Str(ThisElement)
	If @IsBlank(ThisElement) = 0 and @Instr(vStr, ":") = 0
	{
		If @Len(vStr) = 4 then
		{
			ThisElement = @Left(vStr, 2) + ":" + @Right(vStr, 2)
		}
	}
End Subroutine
 

It sounds like you worked it out, but for others looking on:

You don't have to use the colon when entering hours and minutes. You could use a period, which is easier to type. So, you could use "9.2" or "9.02" and Sesame will display "09:02", or use "9.20" and Sesame will display "09:20".