For example, 30 Jan 1980 = MJD 44268.
1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 Jan 44238 44604 44969 45334 45699 46065 46430 46795 47160 47526 Feb 44269 44635 45000 45365 45730 46096 46461 46826 47191 47557 Mar 44298 44663 45028 45393 45759 46124 46489 46854 47220 47585 Apr 44329 44694 45059 45424 45790 46155 46520 46885 47251 47616 May 44359 44724 45089 45454 45820 46185 46550 46915 47281 47646 Jun 44390 44755 45120 45485 45851 46216 46581 46946 47312 47677 Jul 44420 44785 45150 45515 45881 46246 46611 46976 47342 47707 Aug 44451 44816 45181 45546 45912 46277 46642 47007 47373 47738 Sep 44482 44847 45212 45577 45943 46308 46673 47038 47404 47769 Oct 44512 44877 45242 45607 45973 46338 46703 47068 47434 47799 Nov 44543 44908 45273 45638 46004 46369 46734 47099 47465 47830 Dec 44573 44938 45303 45668 46034 46399 46764 47129 47495 47860