PENNSLVANIA SWIGART - JC - no idea if this is your, Daniel SWIGART from Lancaster but I found an estate notice for a Daniel SWIGART, late of Buffalo Township, Armstrong Co PA dated 10 May 1838 (this would NOT be the date of date) The source for this is "Early Deaths & Marriages in Armstrong Co, PA from Kittanning Area Newspapers by Constance Leinweber Mateer.
Also from Armstrong County I found the following SWIGART marriages in The Wolf/Wolfe/Wolff Family of Armstrong County PA published by Mechling Associates, Inc.
Janet ADAMS b 29 Jun 1860 of East Franklin Twp., dau of Sarah A. SWIGART and Robert ADAMS, married on 19 Mar 1878 Gilbert Jamison WOLF b 1858.
William Horation SWIGART b 17 Dec 1885 m Sadie Jane JOHN b 10 Apr 1888, dau of Adam JOHN b 07 Jan 1844 and Eleanor LYTLE b 26 Dec 1851 Sommerset Co PA.
Laura SWIGART was the first wife of Findley Walter JOHN, b 16 Feb 1890. Second wife Pearl MORRIS. Third wife Alice Hoover STEWART. Findley died 10 Apr 1957 and is buried in Lawn Haven Burial Estates.
Florence BARNHART b 18 Feb 1899, dau of Minnie MATEER and Walter Henry BARNHART m Clarence SCHAUB b 09 May 1900, son of Nettie SWIGART and Edwin SCHAUB
Myra BARNHART n 22 Jan 1903, dau of Minnie MATEER and Walter Henry BARNHART m John FREEMAN b 12 Nov 1900 son of Sarah SWIGART and Clark FREEMAN