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Time settings are at Settings -> General in your blog’s Dashboard, but those won’t be related to any lost content.

Are you using any sort of caching plugin, or do you see a “Clear/Purge Cache” button in your Dashboard or admin bar? If so, would you please try clearing the cache?

Note: You do not need to install a caching plugin at this point just to clear a cache you don’t have. If you don’t have a caching plugin or a way to clear a server-level cache, just say so. 🙂