Depending on how many friends or family members you have, chances are that not all of them reside in the same time zone. This can cause headaches when trying to determine when or when not to text somebody, as you almost certainly want a timely response, but also don’t want to wake that person up in the middle of (their) night.

Here to help with this dilemma is a newly released and free jailbreak tweak called ContactTime by iOS developer lint. Just as the tweak’s name implies, ContactTime integrates a full-fledged timezone tool into your Contacts list, and if that wasn’t neat enough, the tweak Even lists your contacts’ time zones in the Messages app for you to see at all times.