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Paul Eggert authored
* src/timefns.c (time_arith): Arrange for (time-subtract nil nil) to yield 0, to be consistent with (time-equal-p nil nil). * test/lisp/calendar/time-date-tests.el (test-time-since): New test.
f6dd46cb
* src/timefns.c (time_arith): Arrange for (time-subtract nil nil) to yield 0, to be consistent with (time-equal-p nil nil). * test/lisp/calendar/time-date-tests.el (test-time-since): New test.