Returns the current date and time in datetime format.
This expression has no parameters.
Current date and time.
The result of the NOW function changes only when the column that contains the formula is refreshed. It is not updated continuously.
The TODAY function returns the same date but is not precise with regard to time; the time returned is always 12:00:00 AM and only the date is updated.
Other related functions are:
Contributors: Alberto Ferrari, Marco Russo
MSDN documentation: https://msdn.microsoft.com/en-us/query-bi/dax/now-function-dax