Why in Windows 7 do I see the Data & Time in DateTimePicker inverse and in Windows XP it is fine? (the region and language are the same)
Win7: 2010/12/31 - 51:09 XP : 31/12/2010 - 09:51
You likely messed with the custom region settings. For instance, setting mm:hh instead of hh:mm for time display. The custom settings override the default regional settings.
The settings are used system-wide - in DataTime picker controls as well. If you want to use a certain, fixed format, you can simply set it on the picker.