Add $gmt parameter to the_time() function

[paulschreiber]

It would be helpful to add a $gmt parameter to the_time().

calling:

the_time( 'c', true );

is cleaner/easier than:

echo esc_attr( get_post_time( 'c', true ) );

Use case:
This format of timestamp is required for microformats metadata.

[soulseekah]

Related #20973

[Rarst]

This will break backwards compatibility on the_time filter, since it doesn't have a concept of GMT time being requested. Even if the flag is added to it as parameter, any existing filter out there would not know to check for it.