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class Numeric
UTC_OFFSET_WITH_COLON = '%+03d:%02d'
UTC_OFFSET_WITHOUT_COLON = UTC_OFFSET_WITH_COLON.sub(':', '')
# Assumes self represents an offset from UTC in seconds (as returned from Time#utc_offset)
# and turns this into an +HH:MM formatted string. Example:
#
# -21_600.to_utc_offset_s # => "-06:00"
def to_utc_offset_s(colon = true)
format = colon ? UTC_OFFSET_WITH_COLON : UTC_OFFSET_WITHOUT_COLON
hours = self / 3600
minutes = (abs % 3600) / 60
format % [hours, minutes]
end
end
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