Function parsePdfDate

src/helpers/format.ts:45–93

(str: string)

 * @returns Parsed Date, or undefined if invalid
 */
export function parsePdfDate(str: string): Date | undefined {
  // Remove D: prefix if present
  let s = str;

  if (s.startsWith("D:")) {
    s = s.slice(2);
  }

  // Minimum: YYYY (4 chars) and must start with digits
  if (s.length < 4 || !/^\d{4}/.test(s)) {
    return undefined;
  }

  try {
    const year = parseInt(s.slice(0, 4), 10);
    const month = s.length >= 6 ? parseInt(s.slice(4, 6), 10) - 1 : 0;
    const day = s.length >= 8 ? parseInt(s.slice(6, 8), 10) : 1;
    const hour = s.length >= 10 ? parseInt(s.slice(8, 10), 10) : 0;
    const minute = s.length >= 12 ? parseInt(s.slice(10, 12), 10) : 0;
    const second = s.length >= 14 ? parseInt(s.slice(12, 14), 10) : 0;

    // Validate parsed values
    if (Number.isNaN(year) || Number.isNaN(month) || Number.isNaN(day)) {
      return undefined;
    }

    // Parse timezone if present
    let tzOffset = 0;

    if (s.length >= 15) {
      const tzChar = s.charAt(14);

      if (tzChar === "Z") {
        tzOffset = 0;
      } else if (tzChar === "+" || tzChar === "-") {
        const tzHour = parseInt(s.slice(15, 17), 10) || 0;
        const tzMin = parseInt(s.slice(18, 20), 10) || 0;
        tzOffset = (tzHour * 60 + tzMin) * (tzChar === "-" ? 1 : -1);
      }
    }

    const date = new Date(Date.UTC(year, month, day, hour, minute, second));
    date.setUTCMinutes(date.getUTCMinutes() + tzOffset);

    return date;
  } catch {
    return undefined;
  }
}

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// Number Formatting