if no timezone is set "get_gmt_from_date()" needs the date to be in 'Y-m-d H:i:s' when 'Y-m-d' works if timezone set

[pbearne]

in the unit test we create posts we just a year e.g. test_validate_date_values_should_process_array_value_for_year this fails as "get_gmt_from_date()" needs the date to be in 'Y-m-d H:i:s' when get_option( 'timezone_string' ) is false.

This patch allows you pass in date string and for the correct date to be returned

[pbearne]

patch and unit tests

[SergeyBiryukov]

Related: #34277

[pbearne]

Related: ##28992

[swissspidy]

Except from some missing spaces around braces this looks good to me.

Any objections?

[pbearne]

patch with whitespaces fixed

[pbearne]

I updated devop to the latest version and re made the patch so I hope it patch OK now

[wonderboymusic]

In 35284:

Formatting: allow date strings to be passed to get_gmt_from_date(), instead of requiring 'Y-m-d H:i:s'.

Adds unit tests.

Props pbearne.
Fixes #34279.