date_i18n() outputs invalid Swatch Internet Time

[Rarst]

Since date_i18n() operates with "WordPress timestamp" which is summed up with time zone offset, it doesn't produce correct result for B format which doesn't vary with time zone.

<?php
var_dump( date( 'B' ), date_i18n( 'B' ) );
// string(3) "692" string(3) "775"

Honestly with all the outstanding problems with the function it's more of a curiosity than urgent problem, but something that needs to be considered if it's ever fixed or replaced.

[remcotolsma]

Added test for date_i18n() outputs invalid Swatch Internet Time ticket 43530.

[remcotolsma]

Path from ticket 24730 can also fix this ticket?

[Rarst]

This isn't ready, patch just refers to work in #24730 on timezone retrieval and I don't think we got it sufficiently robust on PHP 5.2 (if that's even possible).

But! If core is bumped to PHP 5.6 that problem simply goes away, so I am suggesting we hold on for that.

[Rarst]

This should be solved by general refactor in #25768, added the unit test there.