Starting with version 1.3.3,supports "custom date formats" that enables you to specify your own valid and/or invalid date formats. If a custom date format is added to the list, recognizes it as a valid date format, no matter whether it is a normal date format in Excel; likewise, if a custom date format is added to the list, the format will never been seen as a date format, even if Excel itself can apply it.
Let's find out how to use custom date formats by an example.
By default,displays the in-cell icon button for cells formatted with , since Excel can format a date value with the format. Here is how you can change this default behavior by utilizing custom date formats in Excel 2003.