If I have missed something in the UI, I apologise.. But there seems to be an issue/bug with the date picker. If you have users in Europe and others in the US the default formatting of the dates gets a bit screwed up. Take the following scenario.

System default language is set to en-US ,default date is set to mm/dd/yy (US format)

A user in the UK has his personal settings set to: language en-GB, it automatically sets the date format to a UK format (dd/mm/yy ) which cannot be changed to the US format of (mm/dd/yy).

If the UK user goes to a page that has a date picker it will show the default date to be in US format as expected. However when the user picks a date it will default to the UK date format (as expected). BUT, when you submit the form the validation gets upset and tells you to set it to the correct format (IE US format).

The way i see it there are 2 options.

1) Standardise on one date format (best option): In order to do this you need to allow the date options in the User Account setting to be able to select either UK or US date format. Dont bind it to the language setting.

2) Change the validation code so that it allows users to use what ever date format they want and present it in that manner.

Appreciate your input...

Mike

PS, im using the latest patch (4.6.3891)

First a correction. We have recently converted from our own calendar popup to the use of the AJAX Control Toolkit CalendarExtender.

As for the problem you are reporting, we will need more details in order to duplicate the problem. We have tested the ability to specify a date format as either MM/dd/yyyy or dd/MM/yyyy and they both worked as expected.