This function is used to determine the current date and time. It returns a serial number that represents the current date and time in Excel. The results are updated each time a worksheet is opened or refreshed.
NOW()
This function does not accept arguments.
This function is updated only when the spreadsheet or cell containing the function is recalculated. This is a volatile function with version 2.5 or later.
Does not accept data. Returns a numeric value.
If it is 04:50:00 P.M. , February 14, 2019, then:
NOW() gives the result 43510.70174
This function is available in product version 1.0 or later. This function is a volatile function in version 2.5 or later.
DATEVALUE | TIME | Date and Time Functions