To update the time settings on a Windows machine:
- Double-click the time in your taskbar.
- Click the Time Zone tab along the top of the dialogue box.
- Verify that your time zone is selected. If the time zone in which you are located is not displayed, select your time zone from the drop-down menu.
- Verify that the box beside Automatically adjust clock for daylight savings changes is checked.
- Click OK.
For other platforms, please refer to your operating system's help document
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Adjust Time in Mac.
Launch the System Preferences Select the Apple menu in the upper left-hand corner of the menu bar and drag your cursor to "System Preferences." Release the mouse to launch "System Preferences."
Step3Date and Time Preferences Click the "Date and Time" button at the top of the preference panel. Check "Set date and time automatically" if your Mac is connected to the Internet to have your time set automatically. If your Mac is not connected to the Internet, you can set the date and time manually using the arrows above the calendar and clock icons.
Step4Time Zone preferences Click the "Time Zone" button at the top of the preference pane to set your Mac's time zone. You can select the time zone by clicking on the city nearest to your location on the time-zone map, or by clicking on the closest city's pop-up button and dragging to the nearest city to your location.
Step5Clock Preferences Click on the "Clock" button at the top right of the "Date and Time" preferences pane to set the preferences for the menu-bar clock on your Mac's desktop. Click "Show Date and Time" to enable the menu-bar clock. Selecting "Digital" will display the time digitally; clicking "Analog" will display a round analog clock in the menu bar. The check boxes below the radio buttons will further customize your menu-bar clock. If you check the "Announce the Time" box, your Mac will announce the time on the hour, half- or quarter-hour. The "Customize Voice" button selects the built-in voice to use to announce the time. When you've finished setting up your "Date and Time" preferences, click the red "Close Window" button in the upper left-hand corner of the preferences pane to save your changes.