You may set your Windows Vista-based PC to display a time that best suits you, out of the 12-hr or 24-hr formats that are available. If on your PC, the time is currently set in the 12-hr format, you will see that 1 PM will be displayed as 1 PM and not 13 PM, which would have been the case had your PC been set to display the time in a 24-hr format. If the latter holds true for you, you can easily change the time format by following the easy steps mentioned below.

The easy solution to the above issue is as:

1. Click on the ‘Start’ button, and type in “intl.cpl” into the search box and then press ‘Enter’ on your keyboard.
2. Under the ‘Format’ tab, click on the ‘Customize this format’ button.
3. Click on the ‘Time’ tab.
4. Click on the drop down arrow next to Time Format and then change the time format from the drop down list. Here, the capital letter H means 24 hour time, and a single letter means that it won’t display the leading zero.
5. Click ‘Ok’ and then click ‘OK’ again.
6. You can check the time which you have just changed.

Footnotes:

Besides the time format, you can also customize the way your Windows Vista PC displays the date, numbers, and even currency. To modify these, you will have to access the respective option in the Current Format list and accordingly set it to your preferred setting.