I can't seem to find it now but ages ago there was a discussion on here about DateTime variables and SWM put quite a lot of detail in it

I have a situation where I am integrating with MS office and I need to pass some time information but FlexCom has defined it as a DateTime

Procedure Set ComStartTime DateTime value
Can I just set the time part of the DateTime before I pass it ?

Are there any side effects to doing this ?