Python: Email Users at 5Am According to Their Timezone

Think Google calendar but I have a table with a list of reminders to send my users. Since my users are global, I can't email everyone at 5AM EST. I'll have a cronjob that runs every hour. If a record matches the date they've entered and 5AM, then email the user. I haven't figured out the SQL part of it yet, that should be easy (I think), for now I'm using static variables to test the functionality.

I guess my issue is, I want to make sure the script completes in less than a minute or else "5:01" comes around and people will miss their emails. There has to be a better way of doing this.

from datetime import datetime
from pytz import timezone

d_format = "%Y-%m-%d %H:%M"

# This is the value pulled from the database. Format: (Y-m-d 05:00)
record_date = "2013-07-01 05:00"

# Current time in UTC
servertime = datetime.now(timezone('UTC'))

# Let's assume the user lives on the West Coast
user1 = now_utc.astimezone(timezone('US/Pacific'))

if user1.strftime(d_format) == record_date:
    print "Send user an email!"
print ""

# Let's assume the user lives in Singapore
user2 = now_utc.astimezone(timezone('Singapore'))

if user2.strftime(d_format) == record_date:
    print "Send user an email!"
print ""