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fj/gist:3800120

Created September 28, 2012 14:13
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Why time zones suck
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gistfile1.rb
# Ψ irb --prompt=simple
require 'tzinfo'
# => true
tz = TZInfo::Timezone.get 'Asia/Shanghai'
# => #<TZInfo::DataTimezone: Asia/Shanghai>
tz.local_to_utc Time.mktime(1927, 12, 31, 23, 54, 5)
# => 1927-12-31 15:48:13 UTC
tz.local_to_utc Time.mktime(1927, 12, 31, 23, 54, 6)
# => 1927-12-31 15:48:14 UTC
tz.local_to_utc Time.mktime(1927, 12, 31, 23, 54, 7)
# => 1927-12-31 15:48:15 UTC
tz.local_to_utc Time.mktime(1927, 12, 31, 23, 54, 8)
# TZInfo::AmbiguousTime: Time: 1927-12-31 23:54:08 UTC is an ambiguous local time.
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