Help for this page
"msk" => +3*3600, # Moscow
... [ ... 0, 'MSK', ],
use DateTime::Format::RFC3339 qw( ); ... for $f->parse_datetime('2014-09-01T12:00:00Z'), $f->parse_datetime('2015-09-01T12:00:00Z');
16:00:00 15:00:00