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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Phpdftk\Pdf\Core; |
| 6 | |
| 7 | /** |
| 8 | * PDF date string helper — ISO 32000-2 §7.9.4. |
| 9 | * |
| 10 | * PDF dates are encoded as `D:YYYYMMDDHHmmSSOHH'mm`, where `O` is `+`, |
| 11 | * `-`, or `Z`. Producing and consuming these strings by hand is |
| 12 | * error-prone; this helper wraps PHP's DateTimeInterface. |
| 13 | */ |
| 14 | final class PdfDate |
| 15 | { |
| 16 | /** |
| 17 | * Format a PHP DateTime as a PDF date string and return it wrapped |
| 18 | * in a PdfString. |
| 19 | */ |
| 20 | public static function fromDateTime(\DateTimeInterface $dt): PdfString |
| 21 | { |
| 22 | $base = $dt->format('YmdHis'); |
| 23 | $offsetSeconds = $dt->getOffset(); |
| 24 | if ($offsetSeconds === 0) { |
| 25 | $tz = 'Z'; |
| 26 | } else { |
| 27 | $sign = $offsetSeconds >= 0 ? '+' : '-'; |
| 28 | $abs = abs($offsetSeconds); |
| 29 | $hours = intdiv($abs, 3600); |
| 30 | $minutes = intdiv($abs % 3600, 60); |
| 31 | $tz = sprintf("%s%02d'%02d", $sign, $hours, $minutes); |
| 32 | } |
| 33 | return new PdfString('D:' . $base . $tz); |
| 34 | } |
| 35 | |
| 36 | /** |
| 37 | * Parse a PDF date string back into a DateTimeImmutable. Returns |
| 38 | * null on unparseable input. |
| 39 | */ |
| 40 | public static function parse(string $pdfDate): ?\DateTimeImmutable |
| 41 | { |
| 42 | if (!preg_match( |
| 43 | "/^D?:?(\d{4})(\d{2})?(\d{2})?(\d{2})?(\d{2})?(\d{2})?([Z+-])?(\d{2})?'?(\d{2})?'?$/", |
| 44 | $pdfDate, |
| 45 | $m, |
| 46 | )) { |
| 47 | return null; |
| 48 | } |
| 49 | $year = (int) $m[1]; |
| 50 | $month = (int) ($m[2] ?? 1); |
| 51 | $day = (int) ($m[3] ?? 1); |
| 52 | $hour = (int) ($m[4] ?? 0); |
| 53 | $min = (int) ($m[5] ?? 0); |
| 54 | $sec = (int) ($m[6] ?? 0); |
| 55 | |
| 56 | $tz = new \DateTimeZone('UTC'); |
| 57 | if (isset($m[7]) && $m[7] !== '' && $m[7] !== 'Z') { |
| 58 | $sign = $m[7]; |
| 59 | $offH = (int) ($m[8] ?? 0); |
| 60 | $offM = (int) ($m[9] ?? 0); |
| 61 | $tz = new \DateTimeZone(sprintf('%s%02d:%02d', $sign, $offH, $offM)); |
| 62 | } |
| 63 | |
| 64 | try { |
| 65 | return (new \DateTimeImmutable('now', $tz)) |
| 66 | ->setDate($year, $month, $day) |
| 67 | ->setTime($hour, $min, $sec); |
| 68 | } catch (\Throwable) { |
| 69 | return null; |
| 70 | } |
| 71 | } |
| 72 | } |