Setting timezone in OpenCart
- Log into OpenCart as an administrator.
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On the Dashboard in the left sidebar, click Extensions, and then click Marketplace:
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Search for PHP and Database Timezone extension and install it:
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Click on Extensions, select the Modules option under the extension filter type:

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Install the Timezone Sync:
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After installing the extension, click on edit:
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Change its status to Enabled and set the appropriate timezone for your store: