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diff --git a/test/lisp/calendar/time-date-tests.el b/test/lisp/calendar/time-date-tests.el
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+++ b/test/lisp/calendar/time-date-tests.el
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+;;; time-date-tests.el --- tests for calendar/time-date.el    -*- lexical-binding:t -*-
+
+;; Copyright (C) 2019 Free Software Foundation, Inc.
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is free software: you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
+
+;;; Code:
+
+(require 'ert)
+(require 'time-date)
+
+(ert-deftest test-leap-year ()
+  (should-not (date-leap-year-p 1999))
+  (should-not (date-leap-year-p 1900))
+  (should (date-leap-year-p 2000))
+  (should (date-leap-year-p 2004)))
+
+(ert-deftest test-days-in-month ()
+  (should (= (date-days-in-month 2004 2) 29))
+  (should (= (date-days-in-month 2004 3) 31))
+  (should-not (= (date-days-in-month 1900 3) 28)))
+
+(ert-deftest test-ordinal ()
+  (should (equal (time-ordinal-to-date 2008 271)
+                 '(0 0 0 27 9 2008 nil nil nil)))
+  (should (equal (time-ordinal-to-date 2008 1)
+                 '(0 0 0 1 1 2008 nil nil nil)))
+  (should (equal (time-ordinal-to-date 2008 32)
+                 '(0 0 0 1 2 2008 nil nil nil)))
+  (should (equal (time-ordinal-to-date 1981 095)
+                 '(0 0 0 5 4 1981 nil nil nil))))
+
+(require 'ert)
+
+;;; time-date-tests.el ends here