OS X Yosemite: Set the date and time on your Mac
You can have the date and time set automatically using a network time server, or set your computer’s date and time manually. Be sure your time is correct so time stamps on emails, messages, and files are correct.
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Choose Apple menu > System Preferences, then click Date & Time.
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Click Date & Time, then select to set the date and time automatically or manually.
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Automatically: Select “Set date and time automatically,” then choose the network time server for your region.
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Manually: Deselect “Set date and time automatically,” then manually enter the date and time. When you’re done, click Save.
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Click Time Zone, then select to set the time zone automatically or manually.
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Automatically: Select “Set time zone automatically using current location.”
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Manually: Deselect “Set time zone automatically using current location,” click a location on the map, click the Closest City pop-up menu, then choose the city closest to your location.
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Click Clock.
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Show date and time in menu bar: Select the checkbox to see the date and time in the top-left corner of the menu bar. In “Time options” and “Date options,” set how you want the date and time to appear.
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Announce the time: Select the checkbox to hear the time announced, then choose when you want it announced. If you want, you can customize the voice.
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To see the current time anywhere in the world, use the World Clock widget in Today view in Notification Center, or in Dashboard. For more information, see See your day at a glance or Get quick info with Dashboard.
To set the date and time format, choose Apple menu > System Preferences, then click Language & Region.