http://livedocs.adobe.com/ Macromedia LiveDocs - online documentation with user feedback. Copyright 2009, Macromedia, Inc. 2009-11-23T20:53:17 en-us http://livedocs.adobe.com/coldfusion/7/htmldocs/00000518.htm#73763 sivakarthikeyan is correct.<br>It might be helpful to explain the reason this works.<br>I believe the following happens when ColdFusion processes isdate (16A244/5)<br>ColdFusion interprets the parameter as an expression, not a string and is evaluated as a division operation on a hexadecimal number.<br>(It would do so even if the parameter were in quotation marks.)<br>The division is performed, and then the IsDate function determines whether the resulting value, a number, can be converted to a date.<br>Numbers can be converted to dates, so the function returns true. halL 1 1 2007-09-18T07:01:03 http://livedocs.adobe.com/coldfusion/7/htmldocs/00000518.htm#73606 For a String " 16A244/5" isdate (16A244/5) returns true... It means the string entered is date .. <br />Please be aware before using this function.. sivakarthikeyan 0 0 2007-09-13T03:12:41 http://livedocs.adobe.com/coldfusion/7/htmldocs/00000518.htm#33173 Passing numeric data to the ColdFusion IsDate and ParseDateTime functions can yield unexpected results. For example, IsDate may return TRUE for numeric data that are not dates. <br />To work around this behavior, it is always advisable to only pass string data in a supported format to the IsDate and ParseDateTime functions, or, generate date-time data using the Now or CreateDate functions. ASandstrom 0 0 2005-05-09T11:05:36