In the new interface of yahoo, the setting is difficult to fine. On the right side of the inbox page, bleow your account name, the 9 dots and the home icon, there is a Settings link with a little gear after it. Click that link. A drop down box will show with Theme, Message Layout, etc. Towards the bottom you will see 3 dots and More Settings. Click that link. The settings page now shows. On the left menu, click the Viewing Mail link. In the Closest city and timezone, set it to your area. Go back to inbox and see if it is now correct.
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