Extracting day, month, and year numbers from dates in InfoPath

Learn how to use the substring() and number() functions in InfoPath to extract the day, month, and year numbers from an InfoPath date string.

InfoPath dates are stored in the format YYYY-MM-DD as already discussed in Date and time basics in Microsoft Office InfoPath.

The beauty of this format is that you can easily use InfoPath functions, such as substring() and number() to extract the numbers for the day, month, and year from a date .

To extract the day number of a date, use

number(substring(field1, 9, 2))

To extract the month number of a date, use

number(substring(field1, 6, 2))

To extract the year number of a date, use

number(substring(field1, 1, 4))

where field1 represents an InfoPath date picker control on a form template.

Once you have the number, you can do very neat things such as use the number for the month in date together with rules, filters, and a data connection to retrieve the name for the month.

Update (Jan 11, 2009):
The date format used by InfoPath also lends itself well to comparing dates. You can for example easily use this date format together with data validation rules to check whether a start date falls before an end date.

For more InfoPath solutions that make use of dates, see Use Date Picker Controls in InfoPath.

 
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Copyright: This article may not be used on web sites (whether personal or otherwise), copied, disseminated, altered, printed, published, broadcasted, or reproduced in any way without an expressed written consent of S.Y.M. Wong-A-Ton. The techniques demonstrated in this article may be used within any Microsoft InfoPath project. This article is provided without any warranties. Copyright for this article is non-transferrable and remains with the author, S.Y.M. Wong-A-Ton.

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