diff --git a/extensions/calendrier-scolaire/calendrier-scolaire.lua b/extensions/calendrier-scolaire/calendrier-scolaire.lua
new file mode 100644
index 0000000..aa818ed
--- /dev/null
+++ b/extensions/calendrier-scolaire/calendrier-scolaire.lua
@@ -0,0 +1,105 @@
+local extension = ...
+
+local logger = extension:getLogger()
+local Promise = require('jls.lang.Promise')
+local HttpClient = require('jls.net.http.HttpClient')
+local Url = require('jls.net.Url')
+local Date = require('jls.util.Date')
+
+local Thing = require('lha.Thing')
+
+local function concatPath(a, b)
+  if string.find(a, '/$') then
+    return a..b
+  end
+  return a..'/'..b
+end
+
+local function createThing()
+  return Thing:new('School Calendar', 'French school calendar', 'BinarySensor'):addProperty('holiday', {
+    ['@type'] = 'BooleanProperty',
+    title = 'Holiday',
+    type = 'boolean',
+    description = 'Holiday',
+    readOnly = true
+  }, '')
+end
+
+local function whereIn(name, year)
+  return string.format("%s > date'%s-01-01' and %s < date'%s-12-31'", name, year, name, year)
+end
+
+local function getRecords(year)
+  local configuration = extension:getConfiguration()
+  local url = Url:new(configuration.apiUrl) -- https://data.opendatasoft.com/api/explore/v2.1/
+  local path = concatPath(url:getPath(), 'catalog/datasets/'..configuration.datasetId..'/records')
+  local resource = path..'?'..Url.mapToQuery({limit = 20, refine = {
+    'location:"'..configuration.location..'"', 'population:"-"'
+  }, where = string.format("(%s) or (%s)", whereIn('start_date', year), whereIn('end_date', year))})
+  logger:fine('fetching %s', resource)
+  local client = HttpClient:new(url)
+  return client:fetch(resource):next(function(response)
+    if response:getStatusCode() == 200 then
+      return response:json()
+    end
+    return Promise.reject('Response status is '..response:getStatusCode())
+  end):next(function(records)
+    if type(records) == 'table' and type(records.results) == 'table' and #records.results == records.total_count and records.total_count > 0 then
+      return records.results
+    end
+    return Promise.reject('Invalid response')
+  end):finally(function()
+    client:close()
+  end)
+end
+
+local function findRecord(records, time)
+  for _, record in ipairs(records) do
+    local startTime = Date.fromISOString(record.start_date, true)
+    local endTime = Date.fromISOString(record.end_date, true)
+    if time >= startTime and time < endTime then
+      return record
+    end
+  end
+end
+
+local function updateThing(thing, records)
+  local holiday = findRecord(records, Date.now()) ~= nil
+  --logger:info('updateThing() christmas: %s, holiday: %s', findRecord(records, Date.fromISOString('2025-12-25', true)) ~= nil, holiday)
+  logger:fine('updateThing() holiday: %s', holiday)
+  thing:updatePropertyValue('holiday', holiday)
+end
+
+local year
+local records
+local thing
+
+local function update()
+  if thing then
+    local y = os.date('%Y')
+    if records and y == year then
+      updateThing(thing, records)
+    else
+      getRecords(y):next(function(r)
+        logger:fine('records %T', r)
+        records = r
+        year = y
+        if logger:isLoggable(logger.INFO) then
+          for _, record in ipairs(records) do
+            logger:info('%s %s %s', record.start_date, record.end_date, record.description)
+          end
+        end
+        updateThing(thing, records)
+      end):catch(function(reason)
+        logger:warn('Fail to fetch records due to %s', reason)
+      end)
+    end
+  end
+end
+
+extension:subscribeEvent('things', function()
+  thing = extension:syncDiscoveredThingByKey('calendrier-scolaire', createThing)
+  update()
+end)
+
+extension:subscribeEvent('refresh', update)
diff --git a/extensions/calendrier-scolaire/manifest.json b/extensions/calendrier-scolaire/manifest.json
new file mode 100644
index 0000000..ea1505c
--- /dev/null
+++ b/extensions/calendrier-scolaire/manifest.json
@@ -0,0 +1,30 @@
+{
+  "name": "Calendrier Scolaire",
+  "description": "Retrieve french school calendar",
+  "version": "0.1",
+  "script": "calendrier-scolaire.lua",
+  "schema": {
+    "type": "object",
+    "properties": {
+      "apiUrl": {
+        "title": "API URL",
+        "type": "string",
+        "pattern": "^https?://.+$",
+        "default": "https://data.opendatasoft.com/api/explore/v2.1/"
+      },
+      "datasetId": {
+        "title": "Dataset",
+        "type": "string",
+        "pattern": "^[%w%-@_]+$",
+        "required": true,
+        "default": "fr-en-calendrier-scolaire@dataeducation"
+      },
+      "location": {
+        "title": "Location",
+        "type": "string",
+        "required": true,
+        "default": "Normandie"
+      }
+    }
+  }
+}
\ No newline at end of file