format_vars gets incorrect dates for weibo

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This doesn't matter much since weibo doesn't have official support for extra info, but it's quite strange.

The example post I'll be using is https://weibo.com/7286955267/Lg9tvxZRO?type=comment#_rnd1645347763326, but it doesn't seem to matter; they all have the same problem.

Steps to reproduce:

1. Make sure console logging is enabled
2. Go to https://weibo.com/7286955267/Lg9tvxZRO
3. Open the post image of the pandas with the popup
4. Download the image (using the download button or keyboard shortcut doesn't matter)
5. Go to the console under format_vars, all variables related to creation or update date will be July 8th, 2013

This also happens with the m.weibo.cn domain. (https://m.weibo.cn/detail/4738496738102644)