My family was having a hard time figuring out when to call me - they put an extra watch in the kitchen with Japanese time, but still... "Oh you are already asleep? Sorry, what time is it over there?"
I told them to access http://www.timeanddate.com/worldclock/meeting.html and pick date and cities (Tokyo and a town close to where you live I guess), the next page that pops up will give you a "meeting planner" - in pink it marks the times when people are usually asleep, yellow at home (or "not at work and not asleep") and green at work. I just copied a Tokyo-Berlin planner into a word document, added a couple of comments, i.e. PINK IS WHEN I'M SLEEPING!!! and that's it!
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