This tutorial will show you how to change the time format in Windows 7.
Open Control Panel >> Show All Control Panel Items >> Select Regional and Language Options.
On the Formats tab >> Select the format you want as shown in the screenshot >> Click Apply.
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If you wish to customise it further, you can click on the Addition Settings button located at the bottom. Navigate to the Time tab and change it accordingly to your preference.
When done click Ok.
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