Add an RSVP block to an email

For the RSVP date and time, it automatically puts it in the Eastern Time zone. I am in the central time zone but if I adjust my wording and say the eastern time zone times, it will display as that but I'm sure some people will be throw off thinking the event was an hour earlier...I need urgent help with how to change the time zone to not say eastern and just to display the time (or to switch the eastern to say central)? (as my event is getting advertised in 2 days!) THANKS Michelle