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require_relative '../../spec_helper'
require 'date'
describe "DateTime#-" do
it "is able to subtract sub-millisecond precision values" do
date = DateTime.new(2017)
diff = Rational(123456789, 24*60*60*1000*1000)
((date + diff) - date).should == diff
(date - (date + diff)).should == -diff
(date - (date - diff)).should == diff
((date - diff) - date).should == -diff
end
it "correctly calculates sub-millisecond time differences" do #5493
dt1 = DateTime.new(2018, 1, 1, 0, 0, 30)
dt2 = DateTime.new(2018, 1, 1, 0, 1, 29.000001)
((dt2 - dt1) * 24 * 60 * 60).should == 59.000001
end
end
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