Creates a new #GDateTime corresponding to the same instant in time as @datetime, but in UTC.
This call is equivalent to calling g_date_time_to_timezone() with the time zone returned by g_time_zone_new_utc().
the newly created #GDateTime which should be freed with g_date_time_unref(), or %NULL
2.26
See Implementation
Creates a new #GDateTime corresponding to the same instant in time as @datetime, but in UTC.
This call is equivalent to calling g_date_time_to_timezone() with the time zone returned by g_time_zone_new_utc().