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Africa/Casablanca offset incorrect #98

lelelyons opened this Issue Feb 6, 2019 · 2 comments


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lelelyons commented Feb 6, 2019

The offset seems to be incorrect (see below), I believe it should be 3600? Or am I misunderstanding something?

screenshot 2019-02-06 at 14 04 23


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philr commented Feb 6, 2019

Your time zone data is probably out of date. Morocco's change to permanent UTC+1 was included in the 2018g release of the IANA Time Zone Database. Further changes were made to include fallbacks for Ramadan in 2018h.

With the latest data, I get the expected result:

tz = TZInfo::Timezone.get('Africa/Casablanca')
# => #<TZInfo::DataTimezone: Africa/Casablanca>
# => 3600

If you are using ZoneinfoDataSource, check to see if there is an updated tzdata package available for your operating system. Otherwise, you can add tzinfo-data version 1.2018.7 or later to your Gemfile and use RubyDataSource.


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philr commented Feb 6, 2019

The 2018h 'main' definition of Africa/Casablanca uses a base offset of UTC+1 throughout the year and observes negative daylight savings during Ramadan. There is a 'rearguard' version of the IANA Time Zone Database that changes this around so that a base offset of UTC+0 is used throughout the year and positive daylight savings is observed at all times other than during Ramadan.

If you are using ZoneinfoDataSource and have up to date zoneinfo files built from the 'rearguard' definitions, then utc_offset will return 0, but utc_total_offset will return 3600 for most of the year.

Note also that utc_offset and utc_total_offset have been renamed base_utc_offset and observed_utc_offset respectively in tzinfo version 2.0.0.

@lelelyons lelelyons closed this Feb 7, 2019

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