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require 'abstract_unit'
require 'active_support/time'
class DateTimeExtCalculationsTest < Test::Unit::TestCase
def test_to_s
datetime = DateTime.new(2005, 2, 21, 14, 30, 0, 0)
assert_equal "2005-02-21 14:30:00", datetime.to_s(:db)
assert_equal "14:30", datetime.to_s(:time)
assert_equal "21 Feb 14:30", datetime.to_s(:short)
assert_equal "February 21, 2005 14:30", datetime.to_s(:long)
assert_equal "Mon, 21 Feb 2005 14:30:00 +0000", datetime.to_s(:rfc822)
assert_equal "February 21st, 2005 14:30", datetime.to_s(:long_ordinal)
assert_match(/^2005-02-21T14:30:00(Z|\+00:00)$/, datetime.to_s)
end
def test_readable_inspect
datetime = DateTime.new(2005, 2, 21, 14, 30, 0)
assert_equal "Mon, 21 Feb 2005 14:30:00 +0000", datetime.readable_inspect
assert_equal datetime.readable_inspect, datetime.inspect
end
def test_custom_date_format
Time::DATE_FORMATS[:custom] = '%Y%m%d%H%M%S'
assert_equal '20050221143000', DateTime.new(2005, 2, 21, 14, 30, 0).to_s(:custom)
Time::DATE_FORMATS.delete(:custom)
end
def test_to_date
assert_equal Date.new(2005, 2, 21), DateTime.new(2005, 2, 21, 14, 30, 0).to_date
end
def test_to_datetime
assert_equal DateTime.new(2005, 2, 21, 14, 30, 0), DateTime.new(2005, 2, 21, 14, 30, 0).to_datetime
end
def test_to_time
assert_equal Time.utc(2005, 2, 21, 10, 11, 12), DateTime.new(2005, 2, 21, 10, 11, 12, 0, 0).to_time
assert_equal Time.utc_time(2039, 2, 21, 10, 11, 12), DateTime.new(2039, 2, 21, 10, 11, 12, 0, 0).to_time
# DateTimes with offsets other than 0 are returned unaltered
assert_equal DateTime.new(2005, 2, 21, 10, 11, 12, Rational(-5, 24)), DateTime.new(2005, 2, 21, 10, 11, 12, Rational(-5, 24)).to_time
end
def test_civil_from_format
assert_equal DateTime.civil(2010, 5, 4, 0, 0, 0, DateTime.local_offset), DateTime.civil_from_format(:local, 2010, 5, 4)
assert_equal DateTime.civil(2010, 5, 4, 0, 0, 0, 0), DateTime.civil_from_format(:utc, 2010, 5, 4)
end
def test_seconds_since_midnight
assert_equal 1,DateTime.civil(2005,1,1,0,0,1).seconds_since_midnight
assert_equal 60,DateTime.civil(2005,1,1,0,1,0).seconds_since_midnight
assert_equal 3660,DateTime.civil(2005,1,1,1,1,0).seconds_since_midnight
assert_equal 86399,DateTime.civil(2005,1,1,23,59,59).seconds_since_midnight
end
def test_beginning_of_week
assert_equal DateTime.civil(2005,1,31), DateTime.civil(2005,2,4,10,10,10).beginning_of_week
assert_equal DateTime.civil(2005,11,28), DateTime.civil(2005,11,28,0,0,0).beginning_of_week #monday
assert_equal DateTime.civil(2005,11,28), DateTime.civil(2005,11,29,0,0,0).beginning_of_week #tuesday
assert_equal DateTime.civil(2005,11,28), DateTime.civil(2005,11,30,0,0,0).beginning_of_week #wednesday
assert_equal DateTime.civil(2005,11,28), DateTime.civil(2005,12,01,0,0,0).beginning_of_week #thursday
assert_equal DateTime.civil(2005,11,28), DateTime.civil(2005,12,02,0,0,0).beginning_of_week #friday
assert_equal DateTime.civil(2005,11,28), DateTime.civil(2005,12,03,0,0,0).beginning_of_week #saturday
assert_equal DateTime.civil(2005,11,28), DateTime.civil(2005,12,04,0,0,0).beginning_of_week #sunday
end
def test_beginning_of_day
assert_equal DateTime.civil(2005,2,4,0,0,0), DateTime.civil(2005,2,4,10,10,10).beginning_of_day
end
def test_end_of_day
assert_equal DateTime.civil(2005,2,4,23,59,59), DateTime.civil(2005,2,4,10,10,10).end_of_day
end
def test_beginning_of_month
assert_equal DateTime.civil(2005,2,1,0,0,0), DateTime.civil(2005,2,22,10,10,10).beginning_of_month
end
def test_beginning_of_quarter
assert_equal DateTime.civil(2005,1,1,0,0,0), DateTime.civil(2005,2,15,10,10,10).beginning_of_quarter
assert_equal DateTime.civil(2005,1,1,0,0,0), DateTime.civil(2005,1,1,0,0,0).beginning_of_quarter
assert_equal DateTime.civil(2005,10,1,0,0,0), DateTime.civil(2005,12,31,10,10,10).beginning_of_quarter
assert_equal DateTime.civil(2005,4,1,0,0,0), DateTime.civil(2005,6,30,23,59,59).beginning_of_quarter
end
def test_end_of_month
assert_equal DateTime.civil(2005,3,31,23,59,59), DateTime.civil(2005,3,20,10,10,10).end_of_month
assert_equal DateTime.civil(2005,2,28,23,59,59), DateTime.civil(2005,2,20,10,10,10).end_of_month
assert_equal DateTime.civil(2005,4,30,23,59,59), DateTime.civil(2005,4,20,10,10,10).end_of_month
end
def test_beginning_of_year
assert_equal DateTime.civil(2005,1,1,0,0,0), DateTime.civil(2005,2,22,10,10,10).beginning_of_year
end
def test_months_ago
assert_equal DateTime.civil(2005,5,5,10), DateTime.civil(2005,6,5,10,0,0).months_ago(1)
assert_equal DateTime.civil(2004,11,5,10), DateTime.civil(2005,6,5,10,0,0).months_ago(7)
assert_equal DateTime.civil(2004,12,5,10), DateTime.civil(2005,6,5,10,0,0).months_ago(6)
assert_equal DateTime.civil(2004,6,5,10), DateTime.civil(2005,6,5,10,0,0).months_ago(12)
assert_equal DateTime.civil(2003,6,5,10), DateTime.civil(2005,6,5,10,0,0).months_ago(24)
end
def test_months_since
assert_equal DateTime.civil(2005,7,5,10), DateTime.civil(2005,6,5,10,0,0).months_since(1)
assert_equal DateTime.civil(2006,1,5,10), DateTime.civil(2005,12,5,10,0,0).months_since(1)
assert_equal DateTime.civil(2005,12,5,10), DateTime.civil(2005,6,5,10,0,0).months_since(6)
assert_equal DateTime.civil(2006,6,5,10), DateTime.civil(2005,12,5,10,0,0).months_since(6)
assert_equal DateTime.civil(2006,1,5,10), DateTime.civil(2005,6,5,10,0,0).months_since(7)
assert_equal DateTime.civil(2006,6,5,10), DateTime.civil(2005,6,5,10,0,0).months_since(12)
assert_equal DateTime.civil(2007,6,5,10), DateTime.civil(2005,6,5,10,0,0).months_since(24)
assert_equal DateTime.civil(2005,4,30,10), DateTime.civil(2005,3,31,10,0,0).months_since(1)
assert_equal DateTime.civil(2005,2,28,10), DateTime.civil(2005,1,29,10,0,0).months_since(1)
assert_equal DateTime.civil(2005,2,28,10), DateTime.civil(2005,1,30,10,0,0).months_since(1)
assert_equal DateTime.civil(2005,2,28,10), DateTime.civil(2005,1,31,10,0,0).months_since(1)
end
def test_years_ago
assert_equal DateTime.civil(2004,6,5,10), DateTime.civil(2005,6,5,10,0,0).years_ago(1)
assert_equal DateTime.civil(1998,6,5,10), DateTime.civil(2005,6,5,10,0,0).years_ago(7)
assert_equal DateTime.civil(2003,2,28,10), DateTime.civil(2004,2,29,10,0,0).years_ago(1) # 1 year ago from leap day
end
def test_years_since
assert_equal DateTime.civil(2006,6,5,10), DateTime.civil(2005,6,5,10,0,0).years_since(1)
assert_equal DateTime.civil(2012,6,5,10), DateTime.civil(2005,6,5,10,0,0).years_since(7)
assert_equal DateTime.civil(2182,6,5,10), DateTime.civil(2005,6,5,10,0,0).years_since(177)
assert_equal DateTime.civil(2005,2,28,10), DateTime.civil(2004,2,29,10,0,0).years_since(1) # 1 year since leap day
end
def test_prev_year
assert_equal DateTime.civil(2004,6,5,10), DateTime.civil(2005,6,5,10,0,0).prev_year
end
def test_next_year
assert_equal DateTime.civil(2006,6,5,10), DateTime.civil(2005,6,5,10,0,0).next_year
end
def test_ago
assert_equal DateTime.civil(2005,2,22,10,10,9), DateTime.civil(2005,2,22,10,10,10).ago(1)
assert_equal DateTime.civil(2005,2,22,9,10,10), DateTime.civil(2005,2,22,10,10,10).ago(3600)
assert_equal DateTime.civil(2005,2,20,10,10,10), DateTime.civil(2005,2,22,10,10,10).ago(86400*2)
assert_equal DateTime.civil(2005,2,20,9,9,45), DateTime.civil(2005,2,22,10,10,10).ago(86400*2 + 3600 + 25)
end
def test_since
assert_equal DateTime.civil(2005,2,22,10,10,11), DateTime.civil(2005,2,22,10,10,10).since(1)
assert_equal DateTime.civil(2005,2,22,11,10,10), DateTime.civil(2005,2,22,10,10,10).since(3600)
assert_equal DateTime.civil(2005,2,24,10,10,10), DateTime.civil(2005,2,22,10,10,10).since(86400*2)
assert_equal DateTime.civil(2005,2,24,11,10,35), DateTime.civil(2005,2,22,10,10,10).since(86400*2 + 3600 + 25)
assert_equal DateTime.civil(2005,2,22,10,10,11), DateTime.civil(2005,2,22,10,10,10).since(1.333)
assert_equal DateTime.civil(2005,2,22,10,10,12), DateTime.civil(2005,2,22,10,10,10).since(1.667)
end
def test_yesterday
assert_equal DateTime.civil(2005,2,21,10,10,10), DateTime.civil(2005,2,22,10,10,10).yesterday
assert_equal DateTime.civil(2005,2,28,10,10,10), DateTime.civil(2005,3,2,10,10,10).yesterday.yesterday
end
def test_tomorrow
assert_equal DateTime.civil(2005,2,23,10,10,10), DateTime.civil(2005,2,22,10,10,10).tomorrow
assert_equal DateTime.civil(2005,3,2,10,10,10), DateTime.civil(2005,2,28,10,10,10).tomorrow.tomorrow
end
def test_change
assert_equal DateTime.civil(2006,2,22,15,15,10), DateTime.civil(2005,2,22,15,15,10).change(:year => 2006)
assert_equal DateTime.civil(2005,6,22,15,15,10), DateTime.civil(2005,2,22,15,15,10).change(:month => 6)
assert_equal DateTime.civil(2012,9,22,15,15,10), DateTime.civil(2005,2,22,15,15,10).change(:year => 2012, :month => 9)
assert_equal DateTime.civil(2005,2,22,16), DateTime.civil(2005,2,22,15,15,10).change(:hour => 16)
assert_equal DateTime.civil(2005,2,22,16,45), DateTime.civil(2005,2,22,15,15,10).change(:hour => 16, :min => 45)
assert_equal DateTime.civil(2005,2,22,15,45), DateTime.civil(2005,2,22,15,15,10).change(:min => 45)
end
def test_advance
assert_equal DateTime.civil(2006,2,28,15,15,10), DateTime.civil(2005,2,28,15,15,10).advance(:years => 1)
assert_equal DateTime.civil(2005,6,28,15,15,10), DateTime.civil(2005,2,28,15,15,10).advance(:months => 4)
assert_equal DateTime.civil(2005,3,21,15,15,10), DateTime.civil(2005,2,28,15,15,10).advance(:weeks => 3)
assert_equal DateTime.civil(2005,3,5,15,15,10), DateTime.civil(2005,2,28,15,15,10).advance(:days => 5)
assert_equal DateTime.civil(2012,9,28,15,15,10), DateTime.civil(2005,2,28,15,15,10).advance(:years => 7, :months => 7)
assert_equal DateTime.civil(2013,10,3,15,15,10), DateTime.civil(2005,2,28,15,15,10).advance(:years => 7, :months => 19, :days => 5)
assert_equal DateTime.civil(2013,10,17,15,15,10), DateTime.civil(2005,2,28,15,15,10).advance(:years => 7, :months => 19, :weeks => 2, :days => 5)
assert_equal DateTime.civil(2001,12,27,15,15,10), DateTime.civil(2005,2,28,15,15,10).advance(:years => -3, :months => -2, :days => -1)
assert_equal DateTime.civil(2005,2,28,15,15,10), DateTime.civil(2004,2,29,15,15,10).advance(:years => 1) #leap day plus one year
assert_equal DateTime.civil(2005,2,28,20,15,10), DateTime.civil(2005,2,28,15,15,10).advance(:hours => 5)
assert_equal DateTime.civil(2005,2,28,15,22,10), DateTime.civil(2005,2,28,15,15,10).advance(:minutes => 7)
assert_equal DateTime.civil(2005,2,28,15,15,19), DateTime.civil(2005,2,28,15,15,10).advance(:seconds => 9)
assert_equal DateTime.civil(2005,2,28,20,22,19), DateTime.civil(2005,2,28,15,15,10).advance(:hours => 5, :minutes => 7, :seconds => 9)
assert_equal DateTime.civil(2005,2,28,10,8,1), DateTime.civil(2005,2,28,15,15,10).advance(:hours => -5, :minutes => -7, :seconds => -9)
assert_equal DateTime.civil(2013,10,17,20,22,19), DateTime.civil(2005,2,28,15,15,10).advance(:years => 7, :months => 19, :weeks => 2, :days => 5, :hours => 5, :minutes => 7, :seconds => 9)
end
def test_advanced_processes_first_the_date_deltas_and_then_the_time_deltas
# If the time deltas were processed first, the following datetimes would be advanced to 2010/04/01 instead.
assert_equal DateTime.civil(2010, 3, 29), DateTime.civil(2010, 2, 28, 23, 59, 59).advance(:months => 1, :seconds => 1)
assert_equal DateTime.civil(2010, 3, 29), DateTime.civil(2010, 2, 28, 23, 59).advance(:months => 1, :minutes => 1)
assert_equal DateTime.civil(2010, 3, 29), DateTime.civil(2010, 2, 28, 23).advance(:months => 1, :hours => 1)
assert_equal DateTime.civil(2010, 3, 29), DateTime.civil(2010, 2, 28, 22, 58, 59).advance(:months => 1, :hours => 1, :minutes => 1, :seconds => 1)
end
def test_next_week
assert_equal DateTime.civil(2005,2,28), DateTime.civil(2005,2,22,15,15,10).next_week
assert_equal DateTime.civil(2005,3,4), DateTime.civil(2005,2,22,15,15,10).next_week(:friday)
assert_equal DateTime.civil(2006,10,30), DateTime.civil(2006,10,23,0,0,0).next_week
assert_equal DateTime.civil(2006,11,1), DateTime.civil(2006,10,23,0,0,0).next_week(:wednesday)
end
def test_next_month_on_31st
assert_equal DateTime.civil(2005, 9, 30), DateTime.civil(2005, 8, 31).next_month
end
def test_prev_month_on_31st
assert_equal DateTime.civil(2004, 2, 29), DateTime.civil(2004, 3, 31).prev_month
end
def test_xmlschema
assert_match(/^1880-02-28T15:15:10\+00:?00$/, DateTime.civil(1880, 2, 28, 15, 15, 10).xmlschema)
assert_match(/^1980-02-28T15:15:10\+00:?00$/, DateTime.civil(1980, 2, 28, 15, 15, 10).xmlschema)
assert_match(/^2080-02-28T15:15:10\+00:?00$/, DateTime.civil(2080, 2, 28, 15, 15, 10).xmlschema)
assert_match(/^1880-02-28T15:15:10-06:?00$/, DateTime.civil(1880, 2, 28, 15, 15, 10, -0.25).xmlschema)
assert_match(/^1980-02-28T15:15:10-06:?00$/, DateTime.civil(1980, 2, 28, 15, 15, 10, -0.25).xmlschema)
assert_match(/^2080-02-28T15:15:10-06:?00$/, DateTime.civil(2080, 2, 28, 15, 15, 10, -0.25).xmlschema)
end
def test_today_with_offset
Date.stubs(:current).returns(Date.new(2000, 1, 1))
assert_equal false, DateTime.civil(1999,12,31,23,59,59, Rational(-18000, 86400)).today?
assert_equal true, DateTime.civil(2000,1,1,0,0,0, Rational(-18000, 86400)).today?
assert_equal true, DateTime.civil(2000,1,1,23,59,59, Rational(-18000, 86400)).today?
assert_equal false, DateTime.civil(2000,1,2,0,0,0, Rational(-18000, 86400)).today?
end
def test_today_without_offset
Date.stubs(:current).returns(Date.new(2000, 1, 1))
assert_equal false, DateTime.civil(1999,12,31,23,59,59).today?
assert_equal true, DateTime.civil(2000,1,1,0).today?
assert_equal true, DateTime.civil(2000,1,1,23,59,59).today?
assert_equal false, DateTime.civil(2000,1,2,0).today?
end
def test_past_with_offset
DateTime.stubs(:current).returns(DateTime.civil(2005,2,10,15,30,45, Rational(-18000, 86400)))
assert_equal true, DateTime.civil(2005,2,10,15,30,44, Rational(-18000, 86400)).past?
assert_equal false, DateTime.civil(2005,2,10,15,30,45, Rational(-18000, 86400)).past?
assert_equal false, DateTime.civil(2005,2,10,15,30,46, Rational(-18000, 86400)).past?
end
def test_past_without_offset
DateTime.stubs(:current).returns(DateTime.civil(2005,2,10,15,30,45, Rational(-18000, 86400)))
assert_equal true, DateTime.civil(2005,2,10,20,30,44).past?
assert_equal false, DateTime.civil(2005,2,10,20,30,45).past?
assert_equal false, DateTime.civil(2005,2,10,20,30,46).past?
end
def test_future_with_offset
DateTime.stubs(:current).returns(DateTime.civil(2005,2,10,15,30,45, Rational(-18000, 86400)))
assert_equal false, DateTime.civil(2005,2,10,15,30,44, Rational(-18000, 86400)).future?
assert_equal false, DateTime.civil(2005,2,10,15,30,45, Rational(-18000, 86400)).future?
assert_equal true, DateTime.civil(2005,2,10,15,30,46, Rational(-18000, 86400)).future?
end
def test_future_without_offset
DateTime.stubs(:current).returns(DateTime.civil(2005,2,10,15,30,45, Rational(-18000, 86400)))
assert_equal false, DateTime.civil(2005,2,10,20,30,44).future?
assert_equal false, DateTime.civil(2005,2,10,20,30,45).future?
assert_equal true, DateTime.civil(2005,2,10,20,30,46).future?
end
def test_current_returns_date_today_when_zone_default_not_set
with_env_tz 'US/Eastern' do
Time.stubs(:now).returns Time.local(1999, 12, 31, 23, 59, 59)
assert_equal DateTime.new(1999, 12, 31, 23, 59, 59, Rational(-18000, 86400)), DateTime.current
end
end
def test_current_returns_time_zone_today_when_zone_default_set
Time.zone_default = ActiveSupport::TimeZone['Eastern Time (US & Canada)']
with_env_tz 'US/Eastern' do
Time.stubs(:now).returns Time.local(1999, 12, 31, 23, 59, 59)
assert_equal DateTime.new(1999, 12, 31, 23, 59, 59, Rational(-18000, 86400)), DateTime.current
end
ensure
Time.zone_default = nil
end
def test_current_without_time_zone
assert_kind_of DateTime, DateTime.current
end
def test_current_with_time_zone
with_env_tz 'US/Eastern' do
assert_kind_of DateTime, DateTime.current
end
end
def test_acts_like_time
assert DateTime.new.acts_like_time?
end
def test_local_offset
with_env_tz 'US/Eastern' do
assert_equal Rational(-5, 24), DateTime.local_offset
end
with_env_tz 'US/Central' do
assert_equal Rational(-6, 24), DateTime.local_offset
end
end
def test_utc?
assert_equal true, DateTime.civil(2005, 2, 21, 10, 11, 12).utc?
assert_equal true, DateTime.civil(2005, 2, 21, 10, 11, 12, 0).utc?
assert_equal false, DateTime.civil(2005, 2, 21, 10, 11, 12, 0.25).utc?
assert_equal false, DateTime.civil(2005, 2, 21, 10, 11, 12, -0.25).utc?
end
def test_utc_offset
assert_equal 0, DateTime.civil(2005, 2, 21, 10, 11, 12).utc_offset
assert_equal 0, DateTime.civil(2005, 2, 21, 10, 11, 12, 0).utc_offset
assert_equal 21600, DateTime.civil(2005, 2, 21, 10, 11, 12, 0.25).utc_offset
assert_equal( -21600, DateTime.civil(2005, 2, 21, 10, 11, 12, -0.25).utc_offset )
assert_equal( -18000, DateTime.civil(2005, 2, 21, 10, 11, 12, Rational(-5, 24)).utc_offset )
end
def test_utc
assert_equal DateTime.civil(2005, 2, 21, 16, 11, 12, 0), DateTime.civil(2005, 2, 21, 10, 11, 12, Rational(-6, 24)).utc
assert_equal DateTime.civil(2005, 2, 21, 15, 11, 12, 0), DateTime.civil(2005, 2, 21, 10, 11, 12, Rational(-5, 24)).utc
assert_equal DateTime.civil(2005, 2, 21, 10, 11, 12, 0), DateTime.civil(2005, 2, 21, 10, 11, 12, 0).utc
assert_equal DateTime.civil(2005, 2, 21, 9, 11, 12, 0), DateTime.civil(2005, 2, 21, 10, 11, 12, Rational(1, 24)).utc
assert_equal DateTime.civil(2005, 2, 21, 9, 11, 12, 0), DateTime.civil(2005, 2, 21, 10, 11, 12, Rational(1, 24)).getutc
end
def test_formatted_offset_with_utc
assert_equal '+00:00', DateTime.civil(2000).formatted_offset
assert_equal '+0000', DateTime.civil(2000).formatted_offset(false)
assert_equal 'UTC', DateTime.civil(2000).formatted_offset(true, 'UTC')
end
def test_formatted_offset_with_local
dt = DateTime.civil(2005, 2, 21, 10, 11, 12, Rational(-5, 24))
assert_equal '-05:00', dt.formatted_offset
assert_equal '-0500', dt.formatted_offset(false)
end
def test_compare_with_time
assert_equal 1, DateTime.civil(2000) <=> Time.utc(1999, 12, 31, 23, 59, 59)
assert_equal 0, DateTime.civil(2000) <=> Time.utc(2000, 1, 1, 0, 0, 0)
assert_equal(-1, DateTime.civil(2000) <=> Time.utc(2000, 1, 1, 0, 0, 1))
end
def test_compare_with_datetime
assert_equal 1, DateTime.civil(2000) <=> DateTime.civil(1999, 12, 31, 23, 59, 59)
assert_equal 0, DateTime.civil(2000) <=> DateTime.civil(2000, 1, 1, 0, 0, 0)
assert_equal(-1, DateTime.civil(2000) <=> DateTime.civil(2000, 1, 1, 0, 0, 1))
end
def test_compare_with_time_with_zone
assert_equal 1, DateTime.civil(2000) <=> ActiveSupport::TimeWithZone.new( Time.utc(1999, 12, 31, 23, 59, 59), ActiveSupport::TimeZone['UTC'] )
assert_equal 0, DateTime.civil(2000) <=> ActiveSupport::TimeWithZone.new( Time.utc(2000, 1, 1, 0, 0, 0), ActiveSupport::TimeZone['UTC'] )
assert_equal(-1, DateTime.civil(2000) <=> ActiveSupport::TimeWithZone.new( Time.utc(2000, 1, 1, 0, 0, 1), ActiveSupport::TimeZone['UTC'] ))
end
def test_to_f
assert_equal 946684800.0, DateTime.civil(2000).to_f
assert_equal 946684800.0, DateTime.civil(1999,12,31,19,0,0,Rational(-5,24)).to_f
end
def test_to_i
assert_equal 946684800, DateTime.civil(2000).to_i
end
protected
def with_env_tz(new_tz = 'US/Eastern')
old_tz, ENV['TZ'] = ENV['TZ'], new_tz
yield
ensure
old_tz ? ENV['TZ'] = old_tz : ENV.delete('TZ')
end
end
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