Select the cell or the column you want to change the format of time on. Right click to bring up the dialog menu, then click on "Format Cells..."
Next Click on the Category Time Then Select within Type : The military time from the examples given
2000 hours in military time means it is 8 o clock p.m.
Noon
1500 is 3:00 PM
Sixty (60), same as a civilian hour.
it means 3 o'clock