La documentation pour développeurs est en anglais.
Type de carte
on_this_day
Historical events and observances for a date.
Version 1 · schema on_this_day.v1.schema.json
Layouts
Every card type has full. Pick a layout with the element's layout attribute, render.layout, or a theme.
Fields
The fields of card.data. Values a source doesn't provide are null; new optional fields can appear within version 1.
| Field | Type | Required | Notes |
|---|---|---|---|
date | date | yes | ISO 8601 calendar date. |
events[] | object[] | yes | |
events[].year | integer | yes | Negative for years BC. |
events[].text | string | yes | |
events[].featured | boolean | The event the text leads with; compact layouts show it. At most one is true; events stay in chronological order. | |
events[].source_url | url | null | ||
observances[] | object[] | yes | |
observances[].name | string | yes | |
observances[].region | string | null | yes |
Example
A recorded answer to “What happened on this day in history?”. Open it in the Answer Lab to see every layout and style.
{
"v": 2,
"id": "ans_0tjhlcau6dxf873p",
"matched": true,
"locale": "en",
"skill": "today",
"confidence": 0.9,
"text": "On this day in 1994: In Seoul, South Korea, 32 people were killed and 17 others injured when a span of the Seongsu Bridge collapsed.\n1096: First Crusade: At the Battle of Civetot, the Seljuk forces of Kilij Arslan destroyed the army of the People's Crusade as it marched toward Nicaea.\n1345: Hundred Years' War: The English victory at the Battle of Auberoche marked a change in the military balance of power in Aquitaine, with the subsequent collapse of the French position.\n1858: French composer Jacques Offenbach's operetta Orpheus in the Underworld, featuring the music most associated with the can-can (audio featured), was first performed at the Théâtre des Bouffes-Parisiens in Paris.",
"speech": "On this day in 1994: In Seoul, South Korea, 32 people were killed and 17 others injured when a span of the Seongsu Bridge collapsed.",
"card": {
"type": "on_this_day",
"version": 1,
"data": {
"date": "2026-10-21",
"events": [
{
"year": 1096,
"text": "First Crusade: At the Battle of Civetot, the Seljuk forces of Kilij Arslan destroyed the army of the People's Crusade as it marched toward Nicaea.",
"featured": false,
"source_url": "https://en.wikipedia.org/wiki/First_Crusade"
},
{
"year": 1345,
"text": "Hundred Years' War: The English victory at the Battle of Auberoche marked a change in the military balance of power in Aquitaine, with the subsequent collapse of the French position.",
"featured": false,
"source_url": "https://en.wikipedia.org/wiki/Hundred_Years'_War"
},
{
"year": 1858,
"text": "French composer Jacques Offenbach's operetta Orpheus in the Underworld, featuring the music most associated with the can-can (audio featured), was first performed at the Théâtre des Bouffes-Parisiens in Paris.",
"featured": false,
"source_url": "https://en.wikipedia.org/wiki/Jacques_Offenbach"
},
{
"year": 1910,
"text": "HMS Niobe arrived in Halifax Harbour to become the first large ship of the Royal Canadian Navy.",
"featured": false,
"source_url": "https://en.wikipedia.org/wiki/HMS_Niobe_(1897)"
},
{
"year": 1959,
"text": "The Solomon R. Guggenheim Museum, designed by American architect Frank Lloyd Wright, opened in New York City.",
"featured": false,
"source_url": "https://en.wikipedia.org/wiki/Solomon_R._Guggenheim_Museum"
},
{
"year": 1966,
"text": "A coal tip fell on the village of Aberfan, Wales, killing 144 people, mostly schoolchildren.",
"featured": false,
"source_url": "https://en.wikipedia.org/wiki/Spoil_tip"
},
{
"year": 1968,
"text": "At the height of the Japanese university protests, protesters occupied Shinjuku Station in Tokyo and clashed violently with police.",
"featured": false,
"source_url": "https://en.wikipedia.org/wiki/1968%E2%80%931969_Japanese_university_protests"
},
{
"year": 1994,
"text": "In Seoul, South Korea, 32 people were killed and 17 others injured when a span of the Seongsu Bridge collapsed.",
"featured": true,
"source_url": "https://en.wikipedia.org/wiki/Seoul"
}
],
"observances": []
}
},
"sources": [
{
"name": "Wikipedia",
"url": "https://en.wikipedia.org/wiki/October_21",
"license": "CC BY-SA 4.0"
}
],
"follow_ups": [],
"actions": [],
"usage": {
"billable": true
}
}