Not exactly sure what you are asking here, but here is the Help link on the Now() function as my assumption is this is the one about which you are inquiring:
Further context of the use case would be very helpful on this question in order to get further information from other Members...
Regards, Brett
To help users find verified answers, please do not forget to use the "Accept as Solution" button on any post(s) that helped you resolve your problem or question. I now work a compressed schedule, Tuesday, Wednesday and Thursday, so those will be the days I will reply to any follow-up posts.