1<?php 2 3/** 4 * webtrees: online genealogy 5 * Copyright (C) 2020 webtrees development team 6 * This program is free software: you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation, either version 3 of the License, or 9 * (at your option) any later version. 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * You should have received a copy of the GNU General Public License 15 * along with this program. If not, see <http://www.gnu.org/licenses/>. 16 */ 17 18declare(strict_types=1); 19 20namespace Fisharebest\Webtrees; 21 22use DomainException; 23use Fisharebest\ExtCalendar\GregorianCalendar; 24use Fisharebest\Webtrees\Date\AbstractCalendarDate; 25use Fisharebest\Webtrees\Date\FrenchDate; 26use Fisharebest\Webtrees\Date\GregorianDate; 27use Fisharebest\Webtrees\Date\HijriDate; 28use Fisharebest\Webtrees\Date\JalaliDate; 29use Fisharebest\Webtrees\Date\JewishDate; 30use Fisharebest\Webtrees\Date\JulianDate; 31use Fisharebest\Webtrees\Date\RomanDate; 32 33use function app; 34use function trigger_error; 35 36use const E_USER_DEPRECATED; 37 38/** 39 * A representation of GEDCOM dates and date ranges. 40 * 41 * Since different calendars start their days at different times, (civil 42 * midnight, solar midnight, sunset, sunrise, etc.), we convert on the basis of 43 * midday. 44 * 45 * We assume that years start on the first day of the first month. Where 46 * this is not the case (e.g. England prior to 1752), we need to use modified 47 * years or the OS/NS notation "4 FEB 1750/51". 48 */ 49class Date 50{ 51 /** @var string Optional qualifier, such as BEF, FROM, ABT */ 52 public $qual1 = ''; 53 54 /** @var AbstractCalendarDate The first (or only) date */ 55 private $date1; 56 57 /** @var string Optional qualifier, such as TO, AND */ 58 public $qual2 = ''; 59 60 /** @var AbstractCalendarDate|null Optional second date */ 61 private $date2; 62 63 /** @var string Optional text, as included with an INTerpreted date */ 64 private $text = ''; 65 66 /** 67 * Create a date, from GEDCOM data. 68 * 69 * @param string $date A date in GEDCOM format 70 */ 71 public function __construct(string $date) 72 { 73 // Extract any explanatory text 74 if (preg_match('/^(.*) ?[(](.*)[)]/', $date, $match)) { 75 $date = $match[1]; 76 $this->text = $match[2]; 77 } 78 if (preg_match('/^(FROM|BET) (.+) (AND|TO) (.+)/', $date, $match)) { 79 $this->qual1 = $match[1]; 80 $this->date1 = $this->parseDate($match[2]); 81 $this->qual2 = $match[3]; 82 $this->date2 = $this->parseDate($match[4]); 83 } elseif (preg_match('/^(TO|FROM|BEF|AFT|CAL|EST|INT|ABT) (.+)/', $date, $match)) { 84 $this->qual1 = $match[1]; 85 $this->date1 = $this->parseDate($match[2]); 86 } else { 87 $this->date1 = $this->parseDate($date); 88 } 89 } 90 91 /** 92 * When we copy a date object, we need to create copies of 93 * its child objects. 94 */ 95 public function __clone() 96 { 97 $this->date1 = clone $this->date1; 98 if ($this->date2 !== null) { 99 $this->date2 = clone $this->date2; 100 } 101 } 102 103 /** 104 * Convert a calendar date, such as "12 JUN 1943" into calendar date object. 105 * A GEDCOM date range may have two calendar dates. 106 * 107 * @param string $date 108 * 109 * @throws DomainException 110 * @return AbstractCalendarDate 111 */ 112 private function parseDate($date): AbstractCalendarDate 113 { 114 // Valid calendar escape specified? - use it 115 if (preg_match('/^(@#D(?:GREGORIAN|JULIAN|HEBREW|HIJRI|JALALI|FRENCH R|ROMAN)+@) ?(.*)/', $date, $match)) { 116 $cal = $match[1]; 117 $date = $match[2]; 118 } else { 119 $cal = ''; 120 } 121 // A date with a month: DM, M, MY or DMY 122 if (preg_match('/^(\d?\d?) ?(JAN|FEB|MAR|APR|MAY|JUN|JUL|AUG|SEP|OCT|NOV|DEC|TSH|CSH|KSL|TVT|SHV|ADR|ADS|NSN|IYR|SVN|TMZ|AAV|ELL|VEND|BRUM|FRIM|NIVO|PLUV|VENT|GERM|FLOR|PRAI|MESS|THER|FRUC|COMP|MUHAR|SAFAR|RABI[AT]|JUMA[AT]|RAJAB|SHAAB|RAMAD|SHAWW|DHUAQ|DHUAH|FARVA|ORDIB|KHORD|TIR|MORDA|SHAHR|MEHR|ABAN|AZAR|DEY|BAHMA|ESFAN) ?((?:\d{1,4}(?: B\.C\.)?|\d\d\d\d\/\d\d)?)$/', $date, $match)) { 123 $d = $match[1]; 124 $m = $match[2]; 125 $y = $match[3]; 126 } elseif (preg_match('/^(\d{1,4}(?: B\.C\.)?|\d\d\d\d\/\d\d)$/', $date, $match)) { 127 // A date with just a year 128 $d = ''; 129 $m = ''; 130 $y = $match[1]; 131 } else { 132 // An invalid date - do the best we can. 133 $d = ''; 134 $m = ''; 135 $y = ''; 136 // Look for a 3/4 digit year anywhere in the date 137 if (preg_match('/\b(\d{3,4})\b/', $date, $match)) { 138 $y = $match[1]; 139 } 140 // Look for a month anywhere in the date 141 if (preg_match('/(JAN|FEB|MAR|APR|MAY|JUN|JUL|AUG|SEP|OCT|NOV|DEC|TSH|CSH|KSL|TVT|SHV|ADR|ADS|NSN|IYR|SVN|TMZ|AAV|ELL|VEND|BRUM|FRIM|NIVO|PLUV|VENT|GERM|FLOR|PRAI|MESS|THER|FRUC|COMP|MUHAR|SAFAR|RABI[AT]|JUMA[AT]|RAJAB|SHAAB|RAMAD|SHAWW|DHUAQ|DHUAH|FARVA|ORDIB|KHORD|TIR|MORDA|SHAHR|MEHR|ABAN|AZAR|DEY|BAHMA|ESFAN)/', $date, $match)) { 142 $m = $match[1]; 143 // Look for a day number anywhere in the date 144 if (preg_match('/\b(\d\d?)\b/', $date, $match)) { 145 $d = $match[1]; 146 } 147 } 148 } 149 150 // Unambiguous dates - override calendar escape 151 if (preg_match('/^(TSH|CSH|KSL|TVT|SHV|ADR|ADS|NSN|IYR|SVN|TMZ|AAV|ELL)$/', $m)) { 152 $cal = JewishDate::ESCAPE; 153 } elseif (preg_match('/^(VEND|BRUM|FRIM|NIVO|PLUV|VENT|GERM|FLOR|PRAI|MESS|THER|FRUC|COMP)$/', $m)) { 154 $cal = FrenchDate::ESCAPE; 155 } elseif (preg_match('/^(MUHAR|SAFAR|RABI[AT]|JUMA[AT]|RAJAB|SHAAB|RAMAD|SHAWW|DHUAQ|DHUAH)$/', $m)) { 156 $cal = HijriDate::ESCAPE; // This is a WT extension 157 } elseif (preg_match('/^(FARVA|ORDIB|KHORD|TIR|MORDA|SHAHR|MEHR|ABAN|AZAR|DEY|BAHMA|ESFAN)$/', $m)) { 158 $cal = JalaliDate::ESCAPE; // This is a WT extension 159 } elseif (preg_match('/^\d{1,4}( B\.C\.)|\d\d\d\d\/\d\d$/', $y)) { 160 $cal = JulianDate::ESCAPE; 161 } 162 163 // Ambiguous dates - don't override calendar escape 164 if ($cal === '') { 165 if (preg_match('/^(JAN|FEB|MAR|APR|MAY|JUN|JUL|AUG|SEP|OCT|NOV|DEC)$/', $m)) { 166 $cal = GregorianDate::ESCAPE; 167 } elseif (preg_match('/^[345]\d\d\d$/', $y)) { 168 // Year 3000-5999 169 $cal = JewishDate::ESCAPE; 170 } else { 171 $cal = GregorianDate::ESCAPE; 172 } 173 } 174 // Now construct an object of the correct type 175 switch ($cal) { 176 case GregorianDate::ESCAPE: 177 return new GregorianDate([ 178 $y, 179 $m, 180 $d, 181 ]); 182 case JulianDate::ESCAPE: 183 return new JulianDate([ 184 $y, 185 $m, 186 $d, 187 ]); 188 case JewishDate::ESCAPE: 189 return new JewishDate([ 190 $y, 191 $m, 192 $d, 193 ]); 194 case HijriDate::ESCAPE: 195 return new HijriDate([ 196 $y, 197 $m, 198 $d, 199 ]); 200 case FrenchDate::ESCAPE: 201 return new FrenchDate([ 202 $y, 203 $m, 204 $d, 205 ]); 206 case JalaliDate::ESCAPE: 207 return new JalaliDate([ 208 $y, 209 $m, 210 $d, 211 ]); 212 case RomanDate::ESCAPE: 213 return new RomanDate([ 214 $y, 215 $m, 216 $d, 217 ]); 218 default: 219 throw new DomainException('Invalid calendar'); 220 } 221 } 222 223 /** 224 * A list of supported calendars and their names. 225 * 226 * @return string[] 227 */ 228 public static function calendarNames(): array 229 { 230 return [ 231 /* I18N: The gregorian calendar */ 232 'gregorian' => I18N::translate('Gregorian'), 233 /* I18N: The julian calendar */ 234 'julian' => I18N::translate('Julian'), 235 /* I18N: The French calendar */ 236 'french' => I18N::translate('French'), 237 /* I18N: The Hebrew/Jewish calendar */ 238 'jewish' => I18N::translate('Jewish'), 239 /* I18N: The Arabic/Hijri calendar */ 240 'hijri' => I18N::translate('Hijri'), 241 /* I18N: The Persian/Jalali calendar */ 242 'jalali' => I18N::translate('Jalali'), 243 ]; 244 } 245 246 /** 247 * Convert a date to the preferred format and calendar(s) display. 248 * 249 * @param bool|null $url Wrap the date in a link to calendar.php 250 * @param string|null $date_format Override the default date format 251 * @param bool|null $convert_calendars Convert the date into other calendars 252 * 253 * @return string 254 */ 255 public function display($url = false, $date_format = null, $convert_calendars = true): string 256 { 257 // Do we need a new DateFormatterService class? 258 if (app()->has(Tree::class)) { 259 $tree = app(Tree::class); 260 $CALENDAR_FORMAT = $tree->getPreference('CALENDAR_FORMAT'); 261 } else { 262 $tree = null; 263 $CALENDAR_FORMAT = ''; 264 } 265 266 if ($date_format === null) { 267 $date_format = I18N::dateFormat(); 268 } 269 270 if ($convert_calendars) { 271 $calendar_format = explode('_and_', $CALENDAR_FORMAT); 272 } else { 273 $calendar_format = []; 274 } 275 276 // Two dates with text before, between and after 277 $q1 = $this->qual1; 278 $d1 = $this->date1->format($date_format, $this->qual1); 279 $q2 = $this->qual2; 280 if ($this->date2 === null) { 281 $d2 = ''; 282 } else { 283 $d2 = $this->date2->format($date_format, $this->qual2); 284 } 285 // Con vert to other calendars, if requested 286 $conv1 = ''; 287 $conv2 = ''; 288 foreach ($calendar_format as $cal_fmt) { 289 if ($cal_fmt !== 'none') { 290 $d1conv = $this->date1->convertToCalendar($cal_fmt); 291 if ($d1conv->inValidRange()) { 292 $d1tmp = $d1conv->format($date_format, $this->qual1); 293 } else { 294 $d1tmp = ''; 295 } 296 if ($this->date2 === null) { 297 $d2conv = null; 298 $d2tmp = ''; 299 } else { 300 $d2conv = $this->date2->convertToCalendar($cal_fmt); 301 if ($d2conv->inValidRange()) { 302 $d2tmp = $d2conv->format($date_format, $this->qual2); 303 } else { 304 $d2tmp = ''; 305 } 306 } 307 // If the date is different from the unconverted date, add it to the date string. 308 if ($d1 != $d1tmp && $d1tmp !== '') { 309 if ($url) { 310 if ($CALENDAR_FORMAT !== 'none') { 311 $conv1 .= ' <span dir="' . I18N::direction() . '">(<a href="' . $d1conv->calendarUrl($date_format, $tree) . '" rel="nofollow">' . $d1tmp . '</a>)</span>'; 312 } else { 313 $conv1 .= ' <span dir="' . I18N::direction() . '"><br><a href="' . $d1conv->calendarUrl($date_format, $tree) . '" rel="nofollow">' . $d1tmp . '</a></span>'; 314 } 315 } else { 316 $conv1 .= ' <span dir="' . I18N::direction() . '">(' . $d1tmp . ')</span>'; 317 } 318 } 319 if ($this->date2 !== null && $d2 != $d2tmp && $d1tmp != '') { 320 if ($url) { 321 $conv2 .= ' <span dir="' . I18N::direction() . '">(<a href="' . $d2conv->calendarUrl($date_format, $tree) . '" rel="nofollow">' . $d2tmp . '</a>)</span>'; 322 } else { 323 $conv2 .= ' <span dir="' . I18N::direction() . '">(' . $d2tmp . ')</span>'; 324 } 325 } 326 } 327 } 328 329 // Add URLs, if requested 330 if ($url) { 331 $d1 = '<a href="' . $this->date1->calendarUrl($date_format, $tree) . '" rel="nofollow">' . $d1 . '</a>'; 332 if ($this->date2 instanceof AbstractCalendarDate) { 333 $d2 = '<a href="' . $this->date2->calendarUrl($date_format, $tree) . '" rel="nofollow">' . $d2 . '</a>'; 334 } 335 } 336 337 // Localise the date 338 switch ($q1 . $q2) { 339 case '': 340 $tmp = $d1 . $conv1; 341 break; 342 case 'ABT': 343 /* I18N: Gedcom ABT dates */ 344 $tmp = I18N::translate('about %s', $d1 . $conv1); 345 break; 346 case 'CAL': 347 /* I18N: Gedcom CAL dates */ 348 $tmp = I18N::translate('calculated %s', $d1 . $conv1); 349 break; 350 case 'EST': 351 /* I18N: Gedcom EST dates */ 352 $tmp = I18N::translate('estimated %s', $d1 . $conv1); 353 break; 354 case 'INT': 355 /* I18N: Gedcom INT dates */ 356 $tmp = I18N::translate('interpreted %s (%s)', $d1 . $conv1, e($this->text)); 357 break; 358 case 'BEF': 359 /* I18N: Gedcom BEF dates */ 360 $tmp = I18N::translate('before %s', $d1 . $conv1); 361 break; 362 case 'AFT': 363 /* I18N: Gedcom AFT dates */ 364 $tmp = I18N::translate('after %s', $d1 . $conv1); 365 break; 366 case 'FROM': 367 /* I18N: Gedcom FROM dates */ 368 $tmp = I18N::translate('from %s', $d1 . $conv1); 369 break; 370 case 'TO': 371 /* I18N: Gedcom TO dates */ 372 $tmp = I18N::translate('to %s', $d1 . $conv1); 373 break; 374 case 'BETAND': 375 /* I18N: Gedcom BET-AND dates */ 376 $tmp = I18N::translate('between %s and %s', $d1 . $conv1, $d2 . $conv2); 377 break; 378 case 'FROMTO': 379 /* I18N: Gedcom FROM-TO dates */ 380 $tmp = I18N::translate('from %s to %s', $d1 . $conv1, $d2 . $conv2); 381 break; 382 default: 383 $tmp = I18N::translate('Invalid date'); 384 break; 385 } 386 387 if (strip_tags($tmp) === '') { 388 return ''; 389 } 390 391 return '<span class="date">' . $tmp . '</span>'; 392 } 393 394 /** 395 * Get the earliest calendar date from this GEDCOM date. 396 * 397 * In the date “FROM 1900 TO 1910”, this would be 1900. 398 * 399 * @return AbstractCalendarDate 400 */ 401 public function minimumDate(): AbstractCalendarDate 402 { 403 return $this->date1; 404 } 405 406 /** 407 * Get the latest calendar date from this GEDCOM date. 408 * 409 * In the date “FROM 1900 TO 1910”, this would be 1910. 410 * 411 * @return AbstractCalendarDate 412 */ 413 public function maximumDate(): AbstractCalendarDate 414 { 415 return $this->date2 ?? $this->date1; 416 } 417 418 /** 419 * Get the earliest Julian day number from this GEDCOM date. 420 * 421 * @return int 422 */ 423 public function minimumJulianDay(): int 424 { 425 return $this->minimumDate()->minimumJulianDay(); 426 } 427 428 /** 429 * Get the latest Julian day number from this GEDCOM date. 430 * 431 * @return int 432 */ 433 public function maximumJulianDay(): int 434 { 435 return $this->maximumDate()->maximumJulianDay(); 436 } 437 438 /** 439 * Get the middle Julian day number from the GEDCOM date. 440 * 441 * For a month-only date, this would be somewhere around the 16th day. 442 * For a year-only date, this would be somewhere around 1st July. 443 * 444 * @return int 445 */ 446 public function julianDay(): int 447 { 448 return intdiv($this->minimumJulianDay() + $this->maximumJulianDay(), 2); 449 } 450 451 /** 452 * Offset this date by N years, and round to the whole year. 453 * 454 * This is typically used to create an estimated death date, 455 * which is before a certain number of years after the birth date. 456 * 457 * @param int $years a number of years, positive or negative 458 * @param string $qualifier typically “BEF” or “AFT” 459 * 460 * @return Date 461 */ 462 public function addYears(int $years, string $qualifier = ''): Date 463 { 464 $tmp = clone $this; 465 $tmp->date1->year += $years; 466 $tmp->date1->month = 0; 467 $tmp->date1->day = 0; 468 $tmp->date1->setJdFromYmd(); 469 $tmp->qual1 = $qualifier; 470 $tmp->qual2 = ''; 471 $tmp->date2 = null; 472 473 return $tmp; 474 } 475 476 /** 477 * Calculate the the age of a person (n years), on a given date. 478 * 479 * @param Date $d1 480 * @param Date $d2 481 * 482 * @return int 483 * 484 * @deprecated since 2.0.4. Will be removed in 2.1.0 485 */ 486 public static function getAgeYears(Date $d1, Date $d2): int 487 { 488 trigger_error('Date::getAgeYears() is deprecated. Use class Age instead.', E_USER_DEPRECATED); 489 490 if (self::compare($d1, $d2) === 0) { 491 // Overlapping dates 492 $jd = $d1->minimumJulianDay(); 493 } else { 494 // Non-overlapping dates 495 $jd = $d2->minimumJulianDay(); 496 } 497 498 if ($jd && $d1->minimumJulianDay() && $d1->minimumJulianDay() <= $jd) { 499 return $d1->minimumDate()->getAge($jd); 500 } 501 502 return -1; 503 } 504 505 /** 506 * Calculate the the age of a person (n days), on a given date. 507 * 508 * @param Date $d1 509 * @param Date $d2 510 * 511 * @return int 512 * 513 * @deprecated since 2.0.4. Will be removed in 2.1.0 514 */ 515 public static function getAgeDays(Date $d1, Date $d2): int 516 { 517 trigger_error('Date::getAgeDays() is deprecated. Use class Age instead.', E_USER_DEPRECATED); 518 519 if ($d2->maximumJulianDay() >= $d1->minimumJulianDay() && $d2->minimumJulianDay() <= $d1->maximumJulianDay()) { 520 // Overlapping dates 521 $jd = $d1->minimumJulianDay(); 522 } else { 523 // Non-overlapping dates 524 $jd = $d2->minimumJulianDay(); 525 } 526 527 // Days - integer only (for sorting, rather than for display) 528 if ($jd && $d1->minimumJulianDay()) { 529 return $jd - $d1->minimumJulianDay(); 530 } 531 532 return -1; 533 } 534 535 /** 536 * Calculate the the age of a person, on a date. 537 * 538 * @param Date $d1 539 * @param Date|null $d2 540 * 541 * @return string 542 * 543 * @deprecated since 2.0.4. Will be removed in 2.1.0 544 */ 545 public static function getAge(Date $d1, Date $d2 = null): string 546 { 547 trigger_error('Date::getAge() is deprecated. Use class Age instead.', E_USER_DEPRECATED); 548 549 if ($d2 instanceof self) { 550 if ($d2->maximumJulianDay() >= $d1->minimumJulianDay() && $d2->minimumJulianDay() <= $d1->maximumJulianDay()) { 551 // Overlapping dates 552 $jd = $d1->minimumJulianDay(); 553 } else { 554 // Non-overlapping dates 555 $jd = $d2->minimumJulianDay(); 556 } 557 } else { 558 // If second date not specified, use today’s date 559 $jd = Carbon::now()->julianDay(); 560 } 561 562 // Just years, in local digits, with warning for negative/ 563 if ($jd && $d1->minimumJulianDay()) { 564 if ($d1->minimumJulianDay() > $jd) { 565 return view('icons/warning'); 566 } 567 568 $years = $d1->minimumDate()->getAge($jd); 569 570 return I18N::number($years); 571 } 572 573 return ''; 574 } 575 576 /** 577 * Calculate the years/months/days between two events 578 * Return a gedcom style age string: "1y 2m 3d" (for fact details) 579 * 580 * @param Date $d1 581 * @param Date|null $d2 582 * 583 * @return string 584 * 585 * @deprecated since 2.0.4. Will be removed in 2.1.0 586 */ 587 public static function getAgeGedcom(Date $d1, Date $d2 = null): string 588 { 589 trigger_error('Date::getAgeGedcom() is deprecated. Use class Age instead.', E_USER_DEPRECATED); 590 591 if ($d2 === null) { 592 return $d1->date1->getAgeFull(Carbon::now()->julianDay()); 593 } 594 595 if (self::compare($d1, $d2) !== 0) { 596 return $d1->date1->getAgeFull($d2->minimumJulianDay()); 597 } 598 599 if ($d1->minimumJulianDay() == $d2->minimumJulianDay()) { 600 return '0d'; 601 } 602 603 return ''; 604 } 605 606 /** 607 * Compare two dates, so they can be sorted. 608 * 609 * return -1 if $a<$b 610 * return +1 if $b>$a 611 * return 0 if dates same/overlap 612 * BEF/AFT sort as the day before/after 613 * 614 * @param Date $a 615 * @param Date $b 616 * 617 * @return int 618 */ 619 public static function compare(Date $a, Date $b): int 620 { 621 // Get min/max JD for each date. 622 switch ($a->qual1) { 623 case 'BEF': 624 $amin = $a->minimumJulianDay() - 1; 625 $amax = $amin; 626 break; 627 case 'AFT': 628 $amax = $a->maximumJulianDay() + 1; 629 $amin = $amax; 630 break; 631 default: 632 $amin = $a->minimumJulianDay(); 633 $amax = $a->maximumJulianDay(); 634 break; 635 } 636 switch ($b->qual1) { 637 case 'BEF': 638 $bmin = $b->minimumJulianDay() - 1; 639 $bmax = $bmin; 640 break; 641 case 'AFT': 642 $bmax = $b->maximumJulianDay() + 1; 643 $bmin = $bmax; 644 break; 645 default: 646 $bmin = $b->minimumJulianDay(); 647 $bmax = $b->maximumJulianDay(); 648 break; 649 } 650 if ($amax < $bmin) { 651 return -1; 652 } 653 654 if ($amin > $bmax && $bmax > 0) { 655 return 1; 656 } 657 658 if ($amin < $bmin && $amax <= $bmax) { 659 return -1; 660 } 661 662 if ($amin > $bmin && $amax >= $bmax && $bmax > 0) { 663 return 1; 664 } 665 666 return 0; 667 } 668 669 /** 670 * Check whether a gedcom date contains usable calendar date(s). 671 * 672 * An incomplete date such as "12 AUG" would be invalid, as 673 * we cannot sort it. 674 * 675 * @return bool 676 */ 677 public function isOK(): bool 678 { 679 return $this->minimumJulianDay() && $this->maximumJulianDay(); 680 } 681 682 /** 683 * Calculate the gregorian year for a date. This should NOT be used internally 684 * within WT - we should keep the code "calendar neutral" to allow support for 685 * jewish/arabic users. This is only for interfacing with external entities, 686 * such as the ancestry.com search interface or the dated fact icons. 687 * 688 * @return int 689 */ 690 public function gregorianYear(): int 691 { 692 if ($this->isOK()) { 693 $gregorian_calendar = new GregorianCalendar(); 694 [$year] = $gregorian_calendar->jdToYmd($this->julianDay()); 695 696 return $year; 697 } 698 699 return 0; 700 } 701} 702