Maybe your Win7″s language is not your mother language,or sometimes you find your display languages of date/time was changed for unknown reason.In this condition you can change the display language of date/time to what you want.
1.Go to Control Panel
2.Click “Region and Language”
3.Under the “Format” tab, select which language of data/time to display,and you can confirm your selection in the “Examples” field
4.Click “OK” to enable your selection.Now move your mouse the the date/time field of taskbar,you will see the display language you selected.