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End of Life Ruby 3.0 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →

instance method

DateTime#to_s

dt.to_s → string

Returns a string in an ISO 8601 format. (This method doesn’t use the expanded representations.)

Example
DateTime.new(2001,2,3,4,5,6,'-7').to_s
                         #=> "2001-02-03T04:05:06-07:00"
See also #to_json #to_time #to_datetime #xmlschema also in 4.1 · 4.0 · 3.4 · 3.3 · 3.2 · 3.1