Hours & minutes calculation

[Guest]

I have inherited a workbook from a previous employee and cannot understand
the following formula.

=IF(AND(((AA22-INT(AA22))>=0.59),((AA22-INT(AA22))<=0.61)),
(AA22+0.4),AA22)

The worksheet is used to work out hours&mins of a working day and in this
case cell AA is 2hrs 59 mins and the above formula returns 2.99. Can someone
explain?
Thanks

 

[Ron de Bruin]

Hi jimar

See this pages for all you want to know about time

http://www.cpearson.com/excel/overtime.htm

http://www.cpearson.com/excel/datetime.htm#AddingTimes

http://www.cpearson.com/excel/datetime.htm#WorkHours