What percent of the world's population is in a timezone whose UTC offset (in hours) is not a multiple of 1?
- To answer this, we need to know what % of the world's population live in each time zone
- A precise answer may be difficult because of changes to offsets throughout the year (e.g. with daylight savings and other adjustments)
Suppose we compare Melbourne's UTC offset to Adelaide's. Melbourne is UTC + 10 hours, whereas Adelaide is UTC + 9.5 hours.
In pseudocode / ruby:
time = Time.current.beginning_of_hour time.in_time_zone("Melbourne") # => Sun, 20 Sep 2020 15:00:00 AEST +10:00 time.in_time_zone("Adelaide") # => Sun, 20 Sep 2020 14:30:00 ACST +09:30
So we can state that (at this time of year), Melbourne's UTC offset (10) is a multiple of 1, whereas Adelaide's (9.5) is not.
Known so far
- A cursory look at the wikipedia page on UTC offsets suggests ~11 out of 38 timezones appear to end in
45(i.e. they don't end in
- This resource is very interesting, but doesn't appear to offer the raw data
- It suggests there are 39 time zones, however, it's from 2015, so perhaps something changed since
- This quora question offers some useful contextual graphics