Board Thread:The Quarters - Q & A/@comment-83.94.112.226-20140605190222/@comment-24150802-20140606082001

HabitRPG  uses whatever timezone is set on the computer/phone/tablet that you are using.

There is a known issue where if you change the timezone on your device, Cron can sometimes run a second time that day (i.e., in addition to the time it ran when you first logged in to HabitRPG at the beginning of the day). This means that you could take twice as much damage as normal from uncompleted to-dos that day. You might want to ensure all to-dos are done before changing timezones, or rest in the inn on the day that you change zones, or make all of your dailies grey dailies (i.e., not scheduled for that day), or keep one device that never has its timezone changed and use HabitRPG on only that device. I realise that each of these workaround would be inconvenient. There's a plan to modify cron in such a way that this issue would no longer happen.

I would REALLY recommend AGAINST using HabitRPG at the same time on devices that have different timezones. The behaviour of cron could be undesirable.

Dailies are the only task type that would be troublesome when changing timezones, so if you don't have many dailies, you might not have significant problems.