Gigatrees Date Formats

supports all of the standard GEDCOM , except for some of the seldom used calendar options. It also supports a wide variety of specialized date formats as used by other genealogy applications and users. The following list includes examples of date formats that are both supported (and unsupported) and shows how those dates will be interpreted and displayed. The list is not exhaustive. The data validation page will display persons having unsupported dates.


FAILURE: 7/8/1850 (not valid)
FAILURE: 8/7/1850 (not valid)
FAILURE: 8.7.1850 (not valid)
FAILURE: 7.8.1850 (not valid)
FAILURE: 8-7-1850 (not valid)
FAILURE: 7-8-1850 (not valid)
FAILURE: 1850/7/8 (not valid)
FAILURE: 1850/8/7 (not valid)
FAILURE: 1850.8.7 (not valid)
FAILURE: 1850.7.8 (not valid)
FAILURE: 1850-8-7 (not valid)
FAILURE: 1850-7-8 (not valid)
FAILURE: 3 1952 (not valid)
FAILURE: 3/1952 (not valid)
FAILURE: 3-1952 (not valid)
FAILURE: >= 3 JAN 1850 (not valid)
FAILURE: 18/19 Oct 1812 (not valid)
FAILURE: 18 or 19 Oct 1812 (not valid)
FAILURE: JAN/FEB/MAR 1850 (not valid)
FAILURE: Q3 1850 (not valid)
FAILURE: Winter 1850 (not valid)

Pass: 1850 => 1850
Pass: 1688/89 => 1688/89
Pass: 1689/90 => 1689/90
Pass: 1699/00 => 1699/00
Pass: 1699/1700 => 1699/00
Pass: 1700/1701 => 1700/01
Pass: 1700/01 => 1700/01
Pass: 1700/1702 => bet 1700 and 1702
Pass: 1700/02 => bet 1700 and 1702
Pass: 1700/10 => bet 1700 and 1710
Pass: 1688-1689 => from 1688 to 1689
Pass: 1688 / 89 => 1688/89
Pass: 1688 \ 89 => 1688/89
Pass: 1688\89 => 1688/89
Pass: 1688 - 1689 => from 1688 to 1689
Pass: 1688 1689 => bet 1688 and 1689
Pass: 1688, 1689 => bet 1688 and 1689
Pass: 1688 1689 1690 1691 => bet 1688 and 1691
Pass: 1688, 1689, 1690, 1691 => bet 1688 and 1691
Pass: 1688, 1689, 1690, 1701 => bet 1688 and 1701
Pass: 1699 1700 1701 => bet 1699 and 1701
Pass: 1699 1700 32 => bet 1699 and 1732
Pass: 1631 32 33 => bet 1631 and 1633
Pass: 1631 and 1632 => bet 1631 and 1632
Pass: 1631 or 1632 => 1631 or 1632
Pass: 1631, 1633 or 1632 => bet 1631 and 1633
Pass: JAN 1850 => Jan 1850
Pass: 1850 JAN => Jan 1850
Pass: 3 JAN 1850 => Jan 3, 1850
Pass: 3 1850 JAN => Jan 3, 1850
Pass: 1850 JAN 3 => Jan 3, 1850
Pass: 1850 3 JAN => Jan 3, 1850
Pass: JAN 1850 3 => Jan 3, 1850
Pass: JAN 3 1850 => Jan 3, 1850
Pass: 3 JAN 1850/51 => Jan 3, 1850/51
Pass: 3 JAN 1850/1 => Jan 3, 1850/51
Pass: 1850/51 JAN 3 => Jan 3, 1850/51
Pass: 1850/1 JAN 3 => Jan 3, 1850/51
Pass: 1850/51 3 JAN => Jan 3, 1850/51
Pass: 1850/1 3 JAN => Jan 3, 1850/51
Pass: January 3, 1850 => Jan 3, 1850
Pass: 1850 MARS => Mar 1850
Pass: (1850 MARS) => Mar 1850
Pass: abt 3 JAN 1850 => abt Jan 3, 1850
Pass: (abt) 3 JAN 1850 => abt Jan 3, 1850
Pass: abt. 3 JAN 1850 => abt Jan 3, 1850
Pass: about 3 JAN 1850 => abt Jan 3, 1850
Pass: circa 3 JAN 1850 => abt Jan 3, 1850
Pass: ca 3 JAN 1850 => abt Jan 3, 1850
Pass: ca. 3 JAN 1850 => abt Jan 3, 1850
Pass: near 3 JAN 1850 => abt Jan 3, 1850
Pass: approx 3 JAN 1850 => abt Jan 3, 1850
Pass: (approx) 3 JAN 1850 => abt Jan 3, 1850
Pass: 3 JAN 1850 abt => abt Jan 3, 1850
Pass: 3 JAN 1850 approx => abt Jan 3, 1850
Pass: 3 JAN 1850 (approx) => Jan 3, 1850 (approx)
Pass: bet 3 JAN 1850 and 1850 JAN 5 => bet Jan 3, 1850 and Jan 5, 1850
Pass: between 3 JAN 1850 and 1850 JAN 5 => bet Jan 3, 1850 and Jan 5, 1850
Pass: betw 3 JAN 1850 and 1850 JAN 5 => bet Jan 3, 1850 and Jan 5, 1850
Pass: bet 3 JAN 1850/1 and 1850/1 JAN 5 => bet Jan 3, 1850/51 and Jan 5, 1850/51
Pass: bet 3 JAN 1850/1 and 1850/2 JAN 5 => bet Jan 3, 1850/51 and Jan 5, 1852
Pass: bet 3 JAN 1850 1853 and 1850 1852 1854 JAN 5 => bet Jan 3, 1850 and Jan 5, 1854
Pass: from 3 JAN 1850 => from Jan 3, 1850
Pass: from 3 JAN 1850 to 1850 JAN 5 => from Jan 3, 1850 to Jan 5, 1850
Pass: bef 3 JAN 1850 => bef Jan 3, 1850
Pass: bef. 3 JAN 1850 => bef Jan 3, 1850
Pass: before 3 JAN 1850 => bef Jan 3, 1850
Pass: by 3 JAN 1850 => by Jan 3, 1850
Pass: <= 3 JAN 1850 => by Jan 3, 1850
Pass: aft 3 JAN 1850 => aft Jan 3, 1850
Pass: after 3 JAN 1850 => aft Jan 3, 1850
Pass: aft. 3 JAN 1850 => aft Jan 3, 1850
Pass: cal 3 JAN 1850 => cal Jan 3, 1850
Pass: cal. 3 JAN 1850 => cal Jan 3, 1850
Pass: calc 3 JAN 1850 => cal Jan 3, 1850
Pass: calc. 3 JAN 1850 => cal Jan 3, 1850
Pass: prob 3 JAN 1850 => prob Jan 3, 1850
Pass: prob. 3 JAN 1850 => prob Jan 3, 1850
Pass: est 3 JAN 1850 => est Jan 3, 1850
Pass: est. 3 JAN 1850 => est Jan 3, 1850
Pass: int 3 JAN 1850 => int Jan 3, 1850
Pass: int. 3 JAN 1850 => int Jan 3, 1850
Pass: int 3 JAN 1850 (found in record) => int Jan 3, 1850 (found in record)
Pass: @#DGREGORIAN@ 3 JAN 1850 => Jan 3, 1850
Pass: @#DJULIAN@ 3 JAN 1850 => Jan 3, 1850 [Julian]
Pass: @#DHEBREW@ 3 JAN 1850 => Jan 3, 1850
Ignoring Unsupported Calendar: @#DHEBREW@
Pass: bet 1689/90 and 1699/00 => bet 1689/90 and 1699/00
Pass: bet 1689/91 and 1699/01 => bet 1689 and 1701
Pass: 1 Hen I => cal 1100 (1 Hen I)
Pass: Hen I => bet 1100 and 1135 (Hen I)
Pass: 3 HEN I => cal 1102 (3 HEN I)
Pass: 3 HEN 1 => cal 1102 (3 HEN 1)
Pass: 53 HEN I => cal 1152 (53 HEN I)
Pass: 3 HEN II => cal 1156 (3 HEN II)
Pass: 3 GEO VI => cal 1938 (3 GEO VI)
Pass: 3 George VI => cal 1938 (3 George VI) [cal 1938 (3 Geo VI)]
Pass: bet 3 HEN I and 4 HEN I => bet 1102 and 1103 (bet 3 HEN I and 4 HEN I)
Pass: bet 3 HEN I and 53 HEN I => bet 1102 and 1152 (bet 3 HEN I and 53 HEN I)
Pass: bet 3 JAN 1000 and 3 HEN I => bet Jan 3, 1000 and 1102 (bet 3 JAN 1000 and 3 HEN I)
Pass: bet 3 JAN 1000 and 53 HEN I => bet Jan 3, 1000 and 1152 (bet 3 JAN 1000 and 53 HEN I)
Pass: bet 3 HEN I and 3 JAN 1200 => bet 1102 and Jan 3, 1200 (bet 3 HEN I and 3 JAN 1200)
Pass: bet 53 HEN I and 3 JAN 1200 => bet 1152 and Jan 3, 1200 (bet 53 HEN I and 3 JAN 1200)
Pass: < 3 JAN 1850 => bef Jan 3, 1850
Pass: > 3 JAN 1850 => aft Jan 3, 1850
Pass: <3 JAN 1850 => bef Jan 3, 1850
Pass: bef Jan 1850
Pass: <1850 => bef 1850
Pass: >3 JAN 1850 => aft Jan 3, 1850
Pass: >JAN 1850 => aft Jan 1850
Pass: >1850 => aft 1850
Pass: ~ 3 JAN 1850 => abt Jan 3, 1850
Pass: ~3 JAN 1850 => abt Jan 3, 1850
Pass: ~1850 JAN 3 => abt Jan 3, 1850
Pass: ~JAN 3 1850 => abt Jan 3, 1850
Pass: Sept 1939 => Sep 1939
Pass: 13 Sept 1945 => Sep 13, 1945
Pass: Feb 3, 1926 => Feb 3, 1926
Pass: c 1977 => abt 1977
Pass: c1977 => abt 1977
Pass: 1949? => maybe 1949
Pass: ?1949 => maybe 1949
Pass: maybe 1949 => maybe 1949
Pass: poss 1949 => maybe 1949
Pass: poss. 1949 => maybe 1949
Pass: possibly 1949 => maybe 1949
Pass: bet 1879 and 1949? => bet 1879 and 1949 (?)
Pass: bet. 1879 and 1949 => bet 1879 and 1949
Pass: bet. 1879-1949 => bet 1879 and 1949
Pass: 1879-1949? => from 1879 to 1949 (?)
Pass: 1879?-1949 => from 1879 to 1949 (?)
Pass: 1879?-1949? => from 1879 to 1949 (?)
Pass: Bet. 1851-1857 => bet 1851 and 1857
Pass: Bet. 1851&1857 => bet 1851 and 1857
Pass: Bet. 1851&1857/8 => bet 1851 and 1857/58
Pass: 11 Jul 1861 or 1868 => Jul 11, 1861 or 1868
Pass: 11 Jul 1861|1868 => Jul 11, 1861 or 1868
Pass: 1775 or 1751 => 1751 or 1775
Pass: 1775|1751 => 1751 or 1775
Pass: 1550/1490 => bet 1490 and 1550
Pass: 10 Jun 1633/16 => bet Jun 10, 1633 and 1716
Pass: 23 Sep 1903 or 3 Sep 1899 => Sep 3, 1899 or Sep 23, 1903
Pass: 11th Feb 1902 => Feb 11, 1902
Pass: 2005, 8 June 2009 - 2 may 2013 => bet Jun 8, 2005 and May 2, 2013
Pass: 30 Feb 1712 => Feb 30, 1712
Pass: bet 6 Mar and 1812 12 JAN => bet Jan 12, 1812 and Mar 6, 1812
Pass: bet Mar 6 and 1812 12 JAN => bet Jan 12, 1812 and Mar 6, 1812
Pass: 1952 comment1 comment2 comment3 => 1952 (comment1 comment2 comment3)
Pass: 1952 (comment1 comment2 comment3) => 1952 (comment1 comment2 comment3)
Pass: 1 Jan 1952 (comment1 comment2 comment3) => Jan 1, 1952 (comment1 comment2 comment3)
Pass: Before 679 He was Murdered => bef 679 (He was Murdered)
Pass: 10 Jun 1633-16 Jun 1633 Christening => from Jun 10, 1633 to Jun 16, 1633 (Christening)
Pass: 10 Jun 1633 to 16 Jun 1633 Christening => from Jun 10, 1633 to Jun 16, 1633 (Christening)
Pass: 21 mai 1984, comment => May 21, 1984 (comment)
Pass: 23 sep 1972, comment => Sep 23, 1972 (comment)
Pass: BET APR AND JUN 1895 => bet Apr 1895 and Jun 1895
Pass: Bet. 1978-1994 => bet 1978 and 1994
Pass: Bet. Apr-Jun 1895 => bet Apr 1895 and Jun 1895
Pass: Jan-Feb-Mar 1939 => from Jan 1939 to Mar 1939
Pass: JAN FEB MAR 1850 => bet Jan 1850 and Mar 1850
Pass: 1990s => bet 1990 and 1999
Pass: 1990's => bet 1990 and 1999
Pass: 1 A.D. => 1
Pass: 0 A.D. => 1 B.C.E.
FAILURE: 0 B.C. (not valid)
Pass: 1 B.C. => 1 B.C.E.
Pass: 2 B.C. => 2 B.C.E.
Pass: 2 B.C.E. => 2 B.C.E.
Pass: 2 B. C. => 2 B.C.E.
Pass: 2 B. C. E. => 2 B.C.E.
Pass: 2 BC => 2 B.C.E.
Pass: 2 B C => 2 B.C.E.
Pass: 2 BCE => 2 B.C.E.
Pass: 2 B C E => 2 B.C.E.
Pass: 2 A.D. => 2
Pass: 2 AD => 2
Pass: 2 A. D. => 2
Pass: 2 A D => 2
Pass: 2 A.C.E. => 2
Pass: 2 ACE => 2
Pass: 2 A. C. E. => 2
Pass: 2 A C E => 2
Pass: bet 4 Jan 0002 BC and 6 Aug 1 B.C. => bet Jan 4, 2 B.C.E. and Aug 6, 1 B.C.E.
Pass: bet 4 Jan 12 BCE and 6 Aug 2 B.C. => bet Jan 4, 12 B.C.E. and Aug 6, 2 B.C.E.
Pass: bet 04 Jan 1000 BC and 6 Aug 10 => bet Jan 4, 1000 B.C.E. and Aug 6, 10
Pass: [17/22] Jan 1895 => [17/22] Jan 1895
Pass: [Jan|Oct] 1895 => [Jan|Oct] 1895
Pass: [Jan 5\Oct 17] 1895 => [Jan 5/Oct 17] 1895
Pass: [Jan 5 or Oct 17] 1895 => [Jan 5 or Oct 17] 1895

Similarily, Gigatrees supports a variety of age formats.

Pass: 76y => 76y
Pass: 76 y => 76y
Pass: 76 years => 76y
Pass: 76 yrs => 76y
Pass: 76years => 76y
Pass: 76yrs => 76y
Pass: 76y 5m => 76y 5m
Pass: 76 y 5 m => 76y 5m
Pass: 76yrs 5mns => 76y 5m
Pass: 76y 5m 4d => 76y 5m 4d
Pass: 76 y 5 m 4 d => 76y 5m 4d
Pass: 76ys 5ms 4ds => 76y 5m 4d
Pass: 0y 0m 0d => 0y 0m 0d
Pass: <76ys => 76y
Pass: < 76ys => 76y
Pass: bef 76ys => 76y
Pass: >76ys => 76y
Pass: > 76ys => 76y
Pass: aft 76 => 76y
Pass: abt 76 => 76y
Tim Forsythe
Tim Forsythe is a retired software engineer and family historian. He is married and living in Santa Rosa, California.
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