Created
October 31, 2012 14:23
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DateTime has wrong offset
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$ irb | |
>> require 'date' | |
=> true | |
# DateTime ignores time zone | |
>> DateTime.new(2012,9,10) | |
=> #<DateTime: 2012-09-10T00:00:00+00:00 ((2456181j,0s,0n),+0s,2299161j)> | |
# Time handles offset correctly | |
>> Time.new(2012, 9, 10) | |
=> 2012-09-10 00:00:00 +0200 | |
# calculations across time zones (summer/winter) are also wrong with DateTime (as one might think...) | |
# DateTime with offset + 01:00 | |
>> DateTime.now | |
=> #<DateTime: 2012-10-29T15:07:10+01:00 ((2456230j,50830s,490918000n),+3600s,2299161j)> | |
# and 10 days ago still with + 01:00 offset | |
>> DateTime.now - 10 | |
=> #<DateTime: 2012-10-19T15:07:20+01:00 ((2456220j,50840s,290852000n),+3600s,2299161j)> | |
>> Time.now | |
=> 2012-10-29 15:07:34 +0100 | |
>> Time.now - 864000 | |
=> 2012-10-19 16:08:23 +0200 | |
# it's also wrong in Rails | |
$ rails c | |
Loading development environment (Rails 3.2.8) | |
>> DateTime.now | |
=> Mon, 29 Oct 2012 16:55:07 +0100 | |
>> DateTime.now - 10.days | |
=> Fri, 19 Oct 2012 16:55:13 +0100 | |
>> Time.now | |
=> 2012-10-29 16:55:16 +0100 | |
>> Time.now - 10.days | |
=> 2012-10-19 16:55:21 +0200 |
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