Explanation

The =NOW() function in MS Excel returns the current date and time.
It is updated automatically whenever the worksheet is opened or calculations are performed.

Some other important functions in MS Excel include:

1. =TODAY() - returns the current date (without time)

2. =YEAR() - returns the year from a given date

3. =MONTH() - returns the month from a given date

4. =DAY() - returns the day from a given date

5. =HOUR() - returns the hour from a given time

6. =MINUTE() - returns the minute from a given time

7. =SECOND() - returns the second from a given time