Changing the Date and Time
Keep your system time accurate, because Windows uses it to timestamp files and email, schedule tasks, and record events.To set the date and time:
1. Choose Start > Control Panel > Date, Time, Language, and Regional Options > Date and Time, or double-click the clock in the taskbar.2. On the Date & Time tab (Figure 4.48 ), adjust the date and time as needed.
Figure 4.48. To set the time in the Time box, type new numbers; press the up- and down-arrow keys; or click the small up and down arrows.

Figure 4.49. The map is decorative; you can't click your location to specify your time zone.

Figure 4.50. For hyperaccurate system time, use Tardis 2000 ($20 U.S.; www.kaska.demon.co.uk) or Dimension 4 (free; www.thinkman.com) to synchronize the clock at fine intervals. When your computer is shut down, the motherboard battery maintains the time.

Tips
Internet-time synchronization occurs regularly only if you have a full-time internet connection such as DSL or cable. If you use dial-up, click Update Now while you're connected to the internet to synchronize your clock immediately.A time server won't synchronize your system time if your date is incorrect.