>One possiblility is (if # seconds < 86400)
>
>

>? ttoc( { 00:00:00 } + abs(DateTimeValue1 - DateTimeValue2), 2)
>

>
>another is (# seconds > 86400)
>
>

>
>local s
>s = abs(DateTimeValue1 - DateTimeValue2)
>?transform( int(s/3600)*10000 + mod(int(s/60),60)*100 + mod(s,60), '99999:99:99')
>

The first one doesn't work. It gives Ambigious date/datetime constant.

The second works but ends up with empty space where no value such as:

  :  :12
  :23:56