Here is a step by step procedure on how to set and customize windows xp date and time settings.
Click on the Start - Control panel and select date and time.
The Date and time properties window opens up displaying date, month, year and current time in analog clock.
You can change the date or time as your current date and time.
Click on Timezone tab to open it.
You can set the timezone by selecting the city of your country which represents the standard time for your country.