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I see two table columns in wordpress tables for time values.

Examples:

post_date post_date_gmt

post_modified post_modified_gmt

comment_date comment_date_gmt

What is the reason behind storing different time types?

3

The post_date is the post_date_gmt after the Timezone value (in Settings) has been applied.

So, if you like, the reasoning is that there's a standard time for everybody, and then your own site's time depending on your Settings, so say you want to change that later, the standard time is always left untouched.

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