Excel Date and Time Format
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- Excel Date and Time Format
- 1.0 is 1 day.
- 0.5 is half of the day - that is 12:00
- 1.1 is 1 day, 2 hours and 24 min
- 30.5 is 30 days and 12 hours
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Microsoft Excel stores dates as sequential numbers known as serial values. Excel stores times as decimal fractions because time is considered a portion of a day. Dates and times are values and so you can add, subtract, and include dates and times in other calculations. For example, to determine the difference between two dates, you can subtract one date from the other. You can view a date as a serial value and a time as a decimal fraction by changing the format of the cell that contains the date or time to General format.
Excel (by default) uses the 1900 date system. This simply means that the date 1 Jan 1900 has a true numeric value of 1, 2 Jan 1900 has a value of 2 etc. These values are called "serial values" in Excel and it is these serial values that allows us to use dates in calculations.
Examples:
Here is the list of most frequently used time fragments:
1 second = 0.00001157
1 minute = 0.000694
5 minutes = 5*0.000694 = 0.00347
1/2 hour = 0.02082
1 hour = 0.04167
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