Data commit

Task/Date-manipulation/Ruby/date-manipulation-1.rb

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+require 'time'
+d = "March 7 2009 7:30pm EST"
+t = Time.parse(d)
+puts t.rfc2822
+puts t.zone
+
+new = t + 12*3600
+puts new.rfc2822
+puts new.zone
+
+# another timezone
+require 'rubygems'
+require 'active_support'
+zone = ActiveSupport::TimeZone['Beijing']
+remote = zone.at(new)
+# or, remote = new.in_time_zone('Beijing')
+puts remote.rfc2822
+puts remote.zone

Task/Date-manipulation/Ruby/date-manipulation-2.rb

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+new = t + 12.hours
+new = t.in(12.hours)
+new = t.advance(:hours => 12)

Task/Date-manipulation/Ruby/date-manipulation-3.rb

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+require "date"
+
+puts d1 = DateTime.parse("March 7 2009 7:30pm EST")
+# d1 + 1 would add a day, so add half a day:
+puts d2 = d1 + 1/2r # 1/2r is a rational; 0.5 would also work
+puts d3 = d2.new_offset('+09:00')