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Understanding Date and Time Formatting Codes

Please Note: This article is written for users of the following Microsoft Excel versions: 97, 2000, 2002, and 2003. If you are using a later version (Excel 2007 or later), this tip may not work for you. For a version of this tip written specifically for later versions of Excel, click here: Understanding Date and Time Formatting Codes.

In Excel, dates and times are stored internally as numbers. These are only converted to legible dates and times when you format the cell using a date or time format. The following table lists the formatting codes that are specific to dates and times. You use these codes when you are creating a custom display format (Format | Cells | Number tab | Custom).

Symbol Meaning
m Displays the month or minutes as a number without a leading 0
mm Displays the month or minutes as a number with a leading 0
mmm Displays the month as abbreviated text (Jan, Feb, Mar, and so on)
mmmm Displays the month as text (January, February, March, and so on)
d Displays the day of the month as a number without a leading 0
dd Displays the day of the month as a number with a leading 0
ddd Displays the day of the week as abbreviated text (Sun, Mon, Tue, and so on)
dddd Displays the day of the week as text (Sunday, Monday, Tuesday, and so on)
yy Displays the year with two digits
yyyy Displays the year with four digits
h Displays the hour without a leading 0
hh Displays the hour with a leading 0
s Displays the seconds without a leading 0
ss Displays the seconds with a leading 0
[ ] When surrounding hours, minutes, or seconds place holders, displays hours greater than 24 or minutes and seconds greater than 60
AM am PM pm A a P p Uses a 12-hour clock, displaying AM or PM as specified
\ Forces display of the following character
. (period) The decimal point.
"text" Displays the text within the quotes.

To understand better the effect of the date and time codes, take a look at the following information, which shows several common date and time formats and how they affect numbers.

Category Format Value Displayed As
Date m/d/yy 34369 2/4/94
 d-mmm-yy 34409 16-Mar-94
Time h:mm AM/PM 0.654166667 3:42 PM
 [h]:mm:ss 2.592673611 62:13:27

Notice that the numbers shown in the value column of these examples are the internal values stored by Excel for dates and times.

ExcelTips is your source for cost-effective Microsoft Excel training. This tip (2179) applies to Microsoft Excel 97, 2000, 2002, and 2003. You can find a version of this tip for the ribbon interface of Excel (Excel 2007 and later) here: Understanding Date and Time Formatting Codes.

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