You can use the same expression with one more conversion

lcTime = TRANSFORM( RIGHT( TTOC(CTOT(lcTime) + 60,1), 6), "@R 99:99:99")

>That works great Sergey, if I'm working with a datetime() value. In my case the value I want to increment by one minute is a time() value.
>
>>

lcTime = TRANSFORM( RIGHT( TTOC(DATETIME() + 60,1), 6), "@R 99:99:99")