What setting in windows determines how the model binder hydrates the model given the datetime coming from the front end as string like this:
27%2F11%2F2012+16%3A09%3A01.21%2F03%2F2013+13%3A51%3A00
In one deployment environment I am getting ModelState.IsValid == false if the first 2 numbers are greater than 12 (i.e. it assumes months rather than days).
The computer will parse the date based on its region (it is set in the control panel in various places depending on the OS). If your two machines have different regional settings, there will be friction as different regions exress dates different (dd/mm/yyyy in the U.K., mm/dd/yyyy in the U.S.). You can override that setting by configuring your web.config to help with consistency.
<globalization culture="en-US" uiCulture="en-US"/>
Another option I would suggest is to save the value of your web form control in the universal date time format: e.g. Tue, 1 Jan 2008 00:00:00 GMT. This will be parsed correctly irrespective of your machine's region.
