В зависимости от того, как далеко вам нужно пройти, вы можете создать таблицу перехода на летнее время, а затем присоединиться к ней и выполнить преобразование с учетом dst. Этот конкретный преобразует из EST в GMT (т.е. использует смещения 5 и 4).
select createdon, dateadd(hour, case when dstlow is null then 5 else 4 end, createdon) as gmt
from photos
left outer join (
SELECT {ts '2009-03-08 02:00:00'} as dstlow, {ts '2009-11-01 02:00:00'} as dsthigh
UNION ALL SELECT {ts '2010-03-14 02:00:00'} as dstlow, {ts '2010-11-07 02:00:00'} as dsthigh
UNION ALL SELECT {ts '2011-03-13 02:00:00'} as dstlow, {ts '2011-11-06 02:00:00'} as dsthigh
UNION ALL SELECT {ts '2012-03-11 02:00:00'} as dstlow, {ts '2012-11-04 02:00:00'} as dsthigh
UNION ALL SELECT {ts '2013-03-10 02:00:00'} as dstlow, {ts '2013-11-03 02:00:00'} as dsthigh
UNION ALL SELECT {ts '2014-03-09 02:00:00'} as dstlow, {ts '2014-11-02 02:00:00'} as dsthigh
UNION ALL SELECT {ts '2015-03-08 02:00:00'} as dstlow, {ts '2015-11-01 02:00:00'} as dsthigh
UNION ALL SELECT {ts '2016-03-13 02:00:00'} as dstlow, {ts '2016-11-06 02:00:00'} as dsthigh
UNION ALL SELECT {ts '2017-03-12 02:00:00'} as dstlow, {ts '2017-11-05 02:00:00'} as dsthigh
UNION ALL SELECT {ts '2018-03-11 02:00:00'} as dstlow, {ts '2018-11-04 02:00:00'} as dsthigh
) dst
on createdon >= dstlow and createdon < dsthigh