{
 "id": "event/hijri-calendar-decree",
 "class": "event",
 "slug": "hijri-calendar-decree",
 "label": {
  "ar": "كتاب عمر التاريخ",
  "en": "'Umar institutes the Hijri calendar (16 AH)"
 },
 "summary": {
  "ar": "في هذه السنة كتب عمر بن الخطاب التاريخ بمشورة علي بن أبي طالب، فجعل مبدأ التاريخ الإسلامي هجرة النبي {cite:kamil-ibn-al-athir p. 351}.",
  "en": "In this year 'Umar instituted the calendar on 'Ali's advice, dating the Islamic era from the Hijra — the convention the umma still keeps {cite:kamil-ibn-al-athir p. 351}."
 },
 "stub": false,
 "wings": [],
 "regions": [],
 "periods": [],
 "tags": [],
 "aliases": [],
 "themes": [],
 "span": {
  "earliest": 637.0006913215193,
  "latest": 638.0000273790383
 },
 "display": {
  "start": {
   "edtf": "0637",
   "hijri": "0016",
   "calendar": "julian",
   "precision": "year",
   "status": "tradition",
   "derived": true,
   "note": "سنة 16؛ التحويل مشتق {cite:kamil-ibn-al-athir p. 351}."
  },
  "end": {
   "edtf": "0637",
   "hijri": "0016",
   "calendar": "julian",
   "precision": "year",
   "status": "tradition",
   "derived": true,
   "note": "سنة 16؛ التحويل مشتق {cite:kamil-ibn-al-athir p. 351}."
  }
 },
 "data": {
  "kind": "law-enacted",
  "date": {
   "start": {
    "edtf": "0637",
    "hijri": "0016",
    "calendar": "julian",
    "precision": "year",
    "status": "tradition",
    "derived": true,
    "note": "سنة 16؛ التحويل مشتق {cite:kamil-ibn-al-athir p. 351}."
   }
  },
  "provenance": {
   "layer": "own-research",
   "source": "الكامل في التاريخ لابن الأثير (دار الكتاب العربي 2012، ج2)، قراءة آبل فيجن",
   "generated_by": "Devin (SWE-2 Medium) from Apple Vision OCR",
   "run": "lib-kamil-v2-batch03"
  },
  "sources": [
   "source/kamil-ibn-al-athir"
  ],
  "status": {
   "review": "draft",
   "completeness": 2,
   "generated_by": "Devin (SWE-2 Medium)"
  }
 },
 "prose": {
  "ar": {
   "sections": [
    {
     "heading": "موجز",
     "markdown": "في سنة ست عشرة كتب عمر بن الخطاب التاريخ بمشورة علي بن أبي طالب، فجُعل مبدأ التاريخ الإسلامي هجرة النبي من مكة إلى المدينة، وهو التأريخ الذي لا تزال الأمة تعمل به {cite:kamil-ibn-al-athir p. 351}."
    }
   ],
   "frontmatter": {
    "id": "event/hijri-calendar-decree",
    "lang": "ar",
    "source_lang": "ar",
    "translators": []
   },
   "updated": "2026-10-21"
  },
  "en": {
   "sections": [
    {
     "heading": "Summary",
     "markdown": "In the year 16, Umar ibn al-Khattab set the dating of the calendar on the advice of Ali ibn Abi Talib. The start of the Islamic calendar was made the Prophet's migration from Mecca to Medina, the dating by which the community still works. {cite:kamil-ibn-al-athir p. 351}."
    }
   ],
   "frontmatter": {
    "id": "event/hijri-calendar-decree",
    "lang": "en",
    "source_lang": "ar",
    "translators": [
     "Claude Haiku 5.5 (claude-haiku-5-5), draft translation"
    ]
   },
   "updated": "2026-10-21"
  },
  "ur": {
   "sections": [
    {
     "heading": "خلاصہ",
     "markdown": "سنہ ۱۶ ہجری میں عمر بن الخطاب نے علی بن ابی طالب کے مشورے سے تاریخ کا حساب مقرر کیا۔ اسلامی تاریخ کی ابتدا نبی کی مکہ سے مدینہ ہجرت کو قرار دیا گیا، یہی وہ تاریخ ہے جس پر امت آج تک عمل کرتی ہے۔ {cite:kamil-ibn-al-athir p. 351}۔"
    }
   ],
   "frontmatter": {
    "id": "event/hijri-calendar-decree",
    "lang": "ur",
    "source_lang": "ar",
    "translators": [
     "Claude Haiku 5.5 (claude-haiku-5-5), draft translation"
    ]
   },
   "updated": "2026-10-21"
  }
 },
 "degree": 6,
 "contemporaries": [],
 "updated": "2026-10-21",
 "connections": [
  {
   "to": "place/madinat-al-mubarak",
   "type": "occurred_at",
   "inverse": false,
   "sources": [
    "source/kamil-ibn-al-athir"
   ]
  },
  {
   "to": "person/umar-ibn-al-khattab",
   "type": "had_participant",
   "inverse": true,
   "sources": [
    "source/kamil-ibn-al-athir"
   ]
  },
  {
   "to": "person/ali-ibn-abi-talib",
   "type": "had_participant",
   "inverse": true,
   "sources": [
    "source/kamil-ibn-al-athir"
   ]
  }
 ],
 "related": [
  "event/abu-sufyan-medina-mission",
  "event/ali-counsel-in-umars-judgments",
  "event/ali-enters-kufa-36",
  "event/badr-aftermath",
  "event/battle-of-badr",
  "event/battle-of-nahawand",
  "event/death-of-abu-bakr",
  "event/death-of-fatima-bint-muhammad"
 ],
 "license": {
  "prose": "CC BY-SA 4.0",
  "data": "CC0 1.0"
 }
}