Changing default WP-Site creation date

There is no blog creation date in WordPress. The first blog post is usually regarded as the blog creation date when you create copyright footer notes for a blog. This is not very reliable though.

There are a few thing that happens by default when WordPress is first installed, the most important being a user is created with ID 1. This is the most accurate way to determine when a blog was created. User 1 is usually the admin or super admin and is not normally deleted, so the user registration date for user 1 is sometimes used to determine blog creation.

Apart from that, WordPress self does not save a date when it was first installed. So your problem is definitely not this. The only dates that really play a big role when it comes to posts is the post date and the post gmt date. Calenders, by default, uses either of ther two dates to display posts according to calender. Some custom ones can use dates set by custom fields, but this is usaully done on site by the site owner

I would suggest that you have alook at both your post dates and post gmt dates and make sure they are correct. I really doubt that any calender scripts out there uses the user registration date as a referrence, but just in case, if your dates are correct, change the user_registered date of user 1 in the wp_users table.

If this don’t work, download a database optimizer plugin and run that on your database and check for any errors

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