Ensure that the cut-off time is in the same timezone as the extended object #1
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…object If we don't match the UTC offset, and the system timezone is not UTC, you end up with the following scenario: = Scenario 1 (correct) Time.now # 2014-08-15 15:30:00 +0100 Time.now.cut_off_time # 2014-08-15 16:00:00 +0100 Time.now.despatch_day # Fri, 15 Aug 2014 = Scenario 2 (incorrect) Time.zone.now # Fri, 15 Aug 2014 15:30:00 BST +01:00 Time.zone.now.cut_off_time # Fri, 15 Aug 2014 16:00:00 BST +01:00 Time.zone.now.despatch_day # Mon, 18 Aug 2014 The incorrect result in Scenario 2 is due to the fact that the ActiveSupport::TimeWithZone class wraps a UTC time object and maintains the timezone data separately. When DateExtension.despatch_day is called in Scenario 2, the context is: self # 2014-08-15 15:30:00 UTC cut_off_time # 2014-08-15 16:00:00 +0100 This comparison is incorrect due to the mismatch in timezones and produces the wrong result. The fix is to construct the cut_off_time based on the timezone of #self.
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Sorry, I spent ages trying to construct a spec to test this, but ran into a brick wall with the way the built-in Time class determines the local time zone. |
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cheers @giddie, I'll see if I can add a test round it. |
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Written that test yet? :) |
Switched to fetching the public holidays from the Government API. This ensures that the dates are always up to date and correct (with a server reboot anyhow).
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If we don't match the UTC offset, and the system timezone is not UTC, you end up
with the following scenario:
Scenario 1 (correct)
Scenario 2 (incorrect)
The incorrect result in Scenario 2 is due to the fact that the
ActiveSupport::TimeWithZone class wraps a UTC time object and maintains the
timezone data separately. When DateExtension.despatch_day is called in Scenario
2, the context is:
This comparison is incorrect due to the mismatch in timezones and produces the
wrong result. The fix is to construct the cut_off_time based on the timezone
of #self.