Most drugs I see have the expiry date listed as (just) month and year
(perhaps unless they have a very short shelf life) - but for anything
that is years away from the manufaacture date is anyone (FDA
included) really asking anyone to believe that one day here or there
is going to make a difference, especially as environmental conditions
are most likely not well controlled.   The hour (or two) of time variation
for summer time is never going to be relevant.