The Excel NOW function is a DATE & TIME function that will return the current date and time.
Date and time
Return current date and time
A serial number representing date and time.
NOW function takes no Arguments
The following formula will return the current time.
Current Date and Time
The serial number returned by the NOW function contains the current date in it. For a cell or cells to display current date along with current time, apply the following Number Format to that cell or cells
NOW function is a Volatile function that will update every time when a worksheet or workbook is recalculated.
To return the current date use TODAY function.
CTRL + SHIFT + : is the shortcut to return the current time into a cell. Note that the time generated using this shortcut is a static value and won’t update automatically.
CTRL + ; + SPACE + CTRL + SHIFT + : is the shortcut to return current date along with current time into an Excel cell