# MS Excel : Perform TIME CALCULATIONS

## MS Excel : Perform TIME CALCULATIONS

Utilizing Excel formulas and capacities, you can perform
Counts with dates and times.You can find, for
example, the number of hours worked between two
times or the number of days between two dates. Date
and time functions convert each date and time into a
serial value that can be added and subtracted and
then converted back into a recognizable date or time.

Excel calculates the serial value of a date as the number
days after January 1, 1900, so each date can be
represented by an integer Excel calculates a
serial value of the time in units of 1/60 of a second.
Each time it can be represented as a serial value
between 0 and 1.

A date and time, such as January 1, 2000, at noon,
consists of the date to the left of the decimal and a
Time to the right. Take the example on August 25, 2005,
at 5:46 p.m. The serial value of date and time is
38589.74028.

Subtracting one date from another implies subtracting
one serial value of another and then convert the
Result on a date or time.

FIND THE DIFFERENCE BETWEEN
TWICE
1 Type the first time in a cell.
Note: If it does not include AM or
PM, Excel by default is a.m. if you
you want p.m., you must write PM.
2 Type the second time in a cell.
3 Click on the cell in which
He wants the results to appear.

4 Enter an equal sign (=).
5 Click on the cell with the last
hour.
6 Enter a minus sign (-).
7 Click on the cell with the previous one
hour.
8 Press Enter.

The result may appear.
As a serial value.

CONVERT A SERIAL VALUE AT ONCE
1 Click on the Start tab.
2 Click on the Number group dialog box
rocket launcher.
l The Format Cells dialog box appears.
3 Click on the Number tab.
4 Click Time.
5 Click on a type of format.
The 13:30 format shows hours: minutes.
6 Click OK.
l The cell shows the number of hours and
minutes between the two times.

### Did you know

Subtracting times that cross
Midnight, like 11 p.m. to 2
a.m., you need a schedule
function called module, or MOD.
The formula is = MOD (later time -
previous time, 1). Thanks to john
Walkenbach Excel 2003 Bible
(Wiley Publishing, 2003) for

### Did you know

If times or dates are subtracted, they are obtained
a negative time or date, this error
is reflected in a series of pounds
signals (######).

### Did you know

Showing a time or date on the
The general format shows your serial
value. Use a time or date format
to show a recognizable date or
hour. To show a time in
hour: minute format, right click on it,
click Cell Format, click Time and
Click on the 13:30 format.