Is there a way to figure out if a given timezone is in daylight
savings?

I have a reminder system setup that allows users to setup reminders
(daily, weekly, monthly, or yearly) however it does not currently
account for daylight savings. I am not exactly sure how to do this but
here is what I was thinking. I stored the time they want to get the
reminder as a datetime but only pay attention to the portions that i
need to. For example, on the daily reminders i dont pay attention to
the date, month, and year. I also store each users timezone. I have a
cron job that runs through all of the reminders setup and if the time
has come across then it sends off a reminder. This all works except i
dont account for daylight savings. I did not even have to worry about
timezones except on the UI end as everythign is stored in UTC and i do
my comparisons in UTC. However, it seems like I will need to look at
if a given user resides in a timezone that is in daylight savings and
adjust the time if necessary. Does that sound right? Is there a way to
see if a given timezone is currently in day light saving?

thanks
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