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Extract Year from a GEDCOM Date String

Source: R/parseLines.R
extractGedcomYear.Rd

Extracts a four-digit year from a GEDCOM date string, stripping calendar escapes (e.g., `\@#DGREGORIAN\@`) and common qualifiers (`ABT`, `BEF`, `AFT`, `BET`/`AND`) before searching for the year. Returns `NA_integer_` when no four-digit year is found.

Usage

extractGedcomYear(x)

Arguments

x

Character vector of GEDCOM date strings.

Value

Integer vector of years.

Examples

extractGedcomYear(c("ABT 1 JAN 1900", "BEF 31 DEC 2000", "1850", NA))
#> [1] 1900 2000 1850   NA