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Maintenance Ruby 3.3 gets fixes, but no new features. Switch to Ruby 4.0 →

instance method

DateTime#sec_fraction

sec_fraction → rational

Returns the fractional part of the second in range (Rational(0, 1)…Rational(1, 1)):

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 · 3.2 · 3.1 · 3.0