method

zone_offset

v2_2_9 - Show latest stable - 0 notes - Class: Time

zone_offset(zone, year=self.now.year) public

Return the number of seconds the specified time zone differs from UTC.

Numeric time zones that include minutes, such as -10:00 or +1330 will work, as will simpler hour-only time zones like -10 or +13.

Textual time zones listed in ZoneOffset are also supported.

If the time zone does not match any of the above, zone_offset will check if the local time zone (both with and without potential Daylight Saving Time changes being in effect) matches zone. Specifying a value for year will change the year used to find the local time zone.

If zone_offset is unable to determine the offset, nil will be returned.

Show source

# File lib/time.rb, line 132
    def zone_offset(zone, year=self.now.year)
      off = nil
      zone = zone.upcase
      if /\A([+-])(\d\d):?(\d\d)\z/ =~ zone
        off = ($1 == '-' ? -1 : 1) * ($2.to_i * 60 + $3.to_i) * 60
      elsif /\A[+-]\d\d\z/ =~ zone
        off = zone.to_i * 3600
      elsif ZoneOffset.include?(zone)
        off = ZoneOffset[zone] * 3600
      elsif ((t = self.local(year, 1, 1)).zone.upcase == zone rescue false)
        off = t.utc_offset
      elsif ((t = self.local(year, 7, 1)).zone.upcase == zone rescue false)
        off = t.utc_offset
      end
      off
    end

zone_offset

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