Context: I'm trying to get an overview of when different people around the globe are typically available, based on their typical times of availability and their timezone.

Software searched for: A tool that provides a graphical overview of when each of these people are available. Not on any particular day. And not necessarily with the intention of finding a single time when all of them are available.

Input: People (or groups thereof) with phases of availability and their timezone (or location, based upon which the timezone is determined).

Output: A picture, possibly looking like a timeline spanning one day, with one bar for each defined person/group, in which timespans of availability are highlighted in some way.

Bonus points for:

  • The picture might alternatively span a week, in which case the people definitions could distinguish availability timespans by day of week.
  • The output is actually multiple pictures, one for each combination of timezones that occur during the year, with the respective validity (e.g. something like "January to March" using daylight-saving time for some of the included places).
  • The fun bit would be what to do about changes such as DST which occur on different dates in different locations - should someone be marked as available or not in the gap between 01:59 and 03:00 in spring? Commented Jun 24, 2022 at 19:24
  • 1
    @SteveBarnes: If one of the places shown in a chart has its DST change on March 5 and another one on March 10, then the result should be (at least) three charts, one valid from the beginning of the year till March 5, one valid between March 5 and March 10, and one from March 10 onward. Anything less than a day doesn't matter; thus the very day where a transition occurs may well be excluded as a "transitory" day for the sake of simplicity.
    – F-H
    Commented Jun 24, 2022 at 19:38
  • The user/group record should also cope with people & groups that spend parts of the year in different locations/TZs presumably. Commented Jun 25, 2022 at 7:17
  • @SteveBarnes: At least for my purposes, it doesn't need to be that elaborate. If I need to cover that case, I am fine with adding two distinct "groups" named "Steve in Tokyo" and "Steve in LA" with different locations/timezones.
    – F-H
    Commented Jun 25, 2022 at 22:11


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