diff -r 3fccf43160a7 -r 07b44a378ad8 server/src/app/Http/Controllers/Api/DateStatsController.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/server/src/app/Http/Controllers/Api/DateStatsController.php	Fri Sep 30 00:43:04 2016 +0200
@@ -0,0 +1,126 @@
+<?php
+
+namespace CorpusParole\Http\Controllers\Api;
+
+// use CorpusParole\Http\Requests;
+use Illuminate\Http\Request;
+use Log;
+
+use CorpusParole\Libraries\Sparql\SparqlClient;
+
+use CorpusParole\Http\Controllers\Controller;
+
+
+class DateStatsController extends Controller
+{
+    private $sparqlClient = null;
+
+    public function __construct(SparqlClient $sparqlClient) {
+        $this->sparqlClient = $sparqlClient;
+    }
+
+    /**
+     * Display the specified resource.
+     *
+     * @return \Illuminate\Http\Response
+     */
+    public function index(Request $request)
+    {
+        $query =  preg_replace('/\s+/', ' ', "SELECT (?d as ?date) (COUNT(?d) AS ?count)
+            WHERE {
+                ?_ a <http://www.europeana.eu/schemas/edm/ProvidedCHO>.
+                ?_ <http://purl.org/dc/terms/created> ?d
+            }
+            GROUP BY ?d
+            ORDER BY ?d");
+
+        $res = $this->sparqlClient->query($query);
+
+        $dates = [];
+
+        foreach ($res as $row) {
+
+            $count = intval($row->count->getValue());
+            $date = $row->date;
+            $dateType = $date->getDatatypeUri();
+
+            $processedDates = [];
+            if($dateType === "http://purl.org/dc/terms/Period") {
+                $processedDates = $this->processPeriod($date->getValue(), $count);
+            }
+            elseif($dateType === "http://purl.org/dc/terms/W3CDTF") {
+                $processedDates = $this->processDate($date->getValue(), $count);
+            }
+
+            $dates = array_reduce(array_keys($processedDates), function($datesArray, $item) use ($processedDates) {
+                if(!isset($datesArray[$item])) {
+                    $datesArray[$item] = 0;
+                }
+                $datesArray[$item] += $processedDates[$item];
+                return $datesArray;
+            }, $dates);
+        }
+
+        ksort($dates);
+
+        return response()->json(['datestats' => $dates ]);
+    }
+
+    private function extractYear($dateStr) {
+        if(preg_match("/^\\d{4}$/", $dateStr) === 1) {
+            $dateStr = "$dateStr-1-1";
+        }
+        $date = date_create($dateStr);
+        if($date === false ) {
+            Log::warning("DateStatsController:extractYear bad format for date $dateStr");
+        }
+        return $date?$date->format("Y"):false;
+    }
+
+    private function processPeriod($periodStr, $count) {
+        $start = null;
+        $end = null;
+        foreach(explode(";", $periodStr) as $elem) {
+            $elem = trim($elem);
+            if(strpos($elem, 'start=') === 0) {
+                $start = intval($this->extractYear(trim(substr($elem, 6))));
+                if($start === false) {
+                    return [];
+                }
+            } elseif(strpos($elem, 'end=') === 0) {
+                $end = intval($this->extractYear(trim(substr($elem, 4))));
+                if($end === false) {
+                    return [];
+                }
+            }
+        }
+
+        if(is_null($start) || is_null($end) || $start>$end ) {
+            // TODO: log problem
+            return [];
+        }
+
+        $res = [];
+        $mean = (int)($count/($end+1-$start));
+        $remains = $count%($end+1-$start);
+        for($d=$start; $d<=$end; $d++) {
+            $nb = $mean + ((($remains--)>0)?1:0);
+            if($nb !== 0) {
+                $res[strval($d)] = $nb;
+            }
+        }
+
+        return $res;
+    }
+
+    private function processDate($dateStr, $count) {
+        $date = $this->extractYear($dateStr);
+        if($date === false)  {
+            return [];
+        } else {
+            return [ $this->extractYear($dateStr) => $count ];
+        }
+    }
+
+
+}