Slide 20
Slide 20 text
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tz = ActiveSupport::TimeZone.new(-5 * 3600) #-28800
#=> #,
@utc_offset=nil>
tz.local(2018, 1, 1)
#=> Mon, 01 Jan 2018 00:00:00 PST -08:00
tz.local(2018, 1, 1).utc_offset
# => -28800
tz.local(2018, 8, 1)
#=> Wed, 01 Aug 2018 00:00:00 PDT -07:00
tz.local(2018, 8, 1).utc_offset
# => -25200 ʢ-28800Ͱnewͨ͠ͷʹʂʂʣ
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