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End of Life Ruby 3.1 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →

instance method

DateTime#sec_fraction

d.sec_fraction → rational

Returns the fractional part of the second.

Example
DateTime.new(2001,2,3,4,5,6.5).sec_fraction       #=> (1/2)
See also #sec #second #rfc3339 #second_fraction also in 4.1 · 4.0 · 3.4 · 3.3 · 3.2 · 3.0