Parse a PDF date string into POSIXct

PDF Info-dictionary dates use the format "D:YYYYMMDDHHmmSS+HH'mm'" (PDF spec, section 7.9.4 - a superset of ISO 8601). This helper extracts the date and time fields and returns UTC POSIXct; the timezone offset suffix is currently ignored (the date is treated as UTC). Truncated strings (e.g. "D:2024") parse to the longest valid prefix.

Usage

pdf_parse_date(s)

Arguments

s

Character vector of PDF date strings.

Value

POSIXct vector (UTC), same length as s. NA for empty or unparseable entries.