Time Zones

Hello,
Is there a way to add a time zone in a Deal related to "bid due"? We work on projects across the world and even though some things adjust to my own time zone, I have found that any dates we manually enter - Bid Date, RFI Due Date, etc. do not appear within our own time zone.
As of now, I have a drop-down to select but is there anything we can do to add a time zone in the field of Date/Time?