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class method
Time.zone_offset
zone_offset(zone, year=self.now.year)
lib/time.rb
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# File tmp/rubies/ruby-3.2.0/lib/time.rb, line 79
def zone_offset(zone, year=self.now.year)
off = nil
zone = zone.upcase
if /\A([+-])(\d\d)(:?)(\d\d)(?:\3(\d\d))?\z/ =~ zone
off = ($1 == '-' ? -1 : 1) * (($2.to_i * 60 + $4.to_i) * 60 + $5.to_i)
elsif zone.match?(/\A[+-]\d\d\z/)
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
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.
Example
require 'time' Time.zone_offset("EST") #=> -18000
You must require ‘time’ to use this method.