Daniel was born in 1779; while is Find A Grave memorial shows a birth date of
5 Feb 1777 at Haverhill MA; the D.A.R. website shows 19 Nov 1779 at the same location, and the 1779 date fits better with the age claimed in his death record. Daniel died in 1846.
Sources
"Massachusetts, Town Clerk, Vital and Town Records, 1626-2001", FamilySearch (https://www.familysearch.org/ark:/61903/1:1:FH6L-ZHG : Fri Mar 08 18:42:01 UTC 2024) SHOWS the death of Daniel Haddock at 67 years of age, born about 1779; died16 November 1846 at Lynn, Essex, Massachusetts, United States.
"Massachusetts Marriages, 1695-1910, 1921-1924", FamilySearch (https://www.familysearch.org/ark:/61903/1:1:FCHV-NQB : 30 December 2022) shows the marriage of Daniel Haddock and Abigail Hazeltine on 23 Aug 1804 at Haverhill, Essex, Massachusetts, United States.
Daughters of the American Revolution (D.A.R) website shows Daniel Haddock born on 19 - Nov - 1779 at Haverhill Essex Co MA died at Lynn Essex Co MA on 8 - Oct - 1846 and his ( 1st ) wife Abigail Haseltine born on 27 - Mar - 1780 at Haverhill Essex Co MA died at Lynn Essex Co MA on 27 - Apr - 1875 married on 23 - Aug - 1804 married at Haverhill Essex Co MA.
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