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We are going to unify the format of date and time returned by DataForSEO Labs
and OnPage API. In particular, we will start using the following format:
yyyy-mm-dd hh-mm-ss +00:00

In the response array you will get the value like this (UTC):

2020-01-01 00:00:00 +00:00

When using filters in a POST array you can just set it this way:
2020-01-01 00:00:00
or
2020-01-01 00:00:00 +00:00

These changes will concern the only field across all DataForSEO Labs API endpoints - last_updated_time.

As for OnPage API, the update concerns the following endpoints and fields:

OnPage API - Summary:

{
crawl_start
crawl_end
certificate_expiration_date
}

OnPage API - Pages, Pages By Resource, Resources, Duplicate Tags, Duplicate Content:

{
fetch_time
}

The update will be rolled out on January 25, 2021. Make sure your script will handle the mentioned changes properly.

If you have any questions, feel free to contact our customer support. We will be happy to explain everything in details.