REF: implement tz_localize_to_utc_single #35108
Merged
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In addition to implementing
tz_localize_to_utc_single
, this replaces all (but one, xref #35102) usages of tz_convert_single that have UTC as the target timezone. In conjunction with 35102, this will allow us to remove the second kwarg altogether, similar to #35104.