I'm not 100% sure what you're asking, but as mentioned above, you can use a variable of type "time" and set it to any time, including the current time. For more on that, I'd play around with one or read:
So if you want a variable that represents the current time, you'll need to set one to the current time right before using it. If you want a string that represents the current time, then RM has one built in ("current" with respect to the time of the trigger event, not necessarily now but basically the same unless you have delays or waits): %time% and %date% are built-in string variables for that purpose.
