Dates in Excel are maintained as whole numbers. Jan 1, 1900 is day 1, Feb
12, 2008 is day 39,340 and Excel's highest date, Dec 31, 9999 is day
2,948,465.
Times in Excel are maintained as decimal fractions of 24 hours. So,
12:00AM, midnight, is 0.000000, 12:01 AM, 1 minute after midnight is
0.000694. (1/(24*60)
1am is 1/24 = 0.041667. 12PM noon is 12/25 = .5 so noon on Feb 12, 2008 is:
39340.5 If there is no date, the time is simply 0.5 Using =MOD(39340.5,1)
produces the remainder after dividing by 1, i.e. 0.5, the time portion of
the date/time. Most books on Excel explain this.

Tyro


"kbee" wrote in message
...
why do u use mod?
cell a1=1/1/08 08:00:00 AM, cell a2= 1/1/08 22:00:00 PM
cell b1 or b2= day/night
what should be the syntax?
thanks to anyone who can help with this.

"kbee" wrote:

I need to convert the data from a cell that contains date and time to a
different cell that will give a result of day /night, which functions
should
I use and what will be their syntax?
if the hours i refere to as day are 7:00AM-18:00PM, and night
18:00Pm-07:00AM
thank you