diff --git a/src/migrations/scripts/1618322296327-clean-data.ts b/src/migrations/scripts/1618322296327-clean-data.ts
new file mode 100644
index 0000000000000000000000000000000000000000..a0278da0f19684b2a751bcabf253242b31359483
--- /dev/null
+++ b/src/migrations/scripts/1618322296327-clean-data.ts
@@ -0,0 +1,103 @@
+import { Db } from 'mongodb';
+import { getDb } from '../migrations-utils/db';
+
+export const up = async () => {
+  const db: Db = await getDb();
+
+  const cursor = db.collection('structures').find({});
+  let document;
+  while ((document = await cursor.next())) {
+    const newDoc = updateStructure(document);
+    await db.collection('structures').updateOne({ _id: document._id }, [{ $set: newDoc }]);
+  }
+  console.log(`Update done`);
+};
+
+export const down = async () => {
+  const db: Db = await getDb();
+
+  const cursor = db.collection('structures').find({});
+  let document;
+  while ((document = await cursor.next())) {
+    const newDoc = downgradeStructure(document);
+    await db.collection('structures').updateOne({ _id: document._id }, [{ $set: newDoc }]);
+  }
+  console.log(`Update done`);
+};
+
+function updateStructure(doc) {
+  doc = updateHours(doc);
+  doc = removeUnusedFields(doc);
+  return doc;
+}
+
+function downgradeStructure(doc) {
+  doc = restoreHours(doc);
+  return doc;
+}
+
+function updateHours(doc) {
+  if (doc.hours) {
+    Object.keys(doc.hours).forEach((key) => {
+      if (doc.hours[key].time.length > 0) {
+        doc.hours[key].time.forEach((timeRange) => {
+          timeRange.openning = formatHours(timeRange.openning);
+          timeRange.closing = formatHours(timeRange.closing);
+        });
+      }
+    });
+    return doc;
+  } else {
+    console.warn(`No hours on doc ${doc._id}`);
+    return doc;
+  }
+}
+
+function restoreHours(doc) {
+  if (doc.hours) {
+    Object.keys(doc.hours).forEach((key) => {
+      if (doc.hours[key].time.length > 0) {
+        doc.hours[key].time.forEach((timeRange) => {
+          timeRange.openning = formatBackHours(timeRange.openning);
+          timeRange.closing = formatBackHours(timeRange.closing);
+        });
+      }
+    });
+    return doc;
+  } else {
+    console.warn(`No hours on doc ${doc._id}`);
+    return doc;
+  }
+}
+
+function formatHours(hour): string {
+  const stringifiedHour = hour.toString();
+  if (stringifiedHour.length === 3) {
+    // 930
+    return stringifiedHour.slice(0, 1) + ':' + stringifiedHour.slice(1, 3);
+  } else if (stringifiedHour.length === 4) {
+    // 1200
+    return stringifiedHour.slice(0, 2) + ':' + stringifiedHour.slice(2, 4);
+  }
+}
+
+function formatBackHours(hour): number {
+  const splitedHour = hour.split(':');
+  return parseInt(''.concat(...splitedHour), 10);
+}
+
+function removeUnusedFields(doc) {
+  if (doc['equipmentDetails']) {
+    delete doc['equipmentDetails'];
+  }
+  if (doc['nomDeLusager']) {
+    delete doc['nomDeLusager'];
+  }
+  if (doc['statutJuridique']) {
+    delete doc['statutJuridique'];
+  }
+  if (doc['documentsMeeting']) {
+    delete doc['documentsMeeting'];
+  }
+  return doc;
+}
diff --git a/src/structures/schemas/time.schema.ts b/src/structures/schemas/time.schema.ts
index 986b7773a38ace7f052d28519321bbb2e37efeab..65109f63a40c61e04044ddb49d8ba95c145fa772 100644
--- a/src/structures/schemas/time.schema.ts
+++ b/src/structures/schemas/time.schema.ts
@@ -4,8 +4,8 @@ import { Document } from 'mongoose';
 export type TimeDocument = Time & Document;
 
 export class Time {
-  openning: number;
-  closing: number;
+  openning: string;
+  closing: string;
 }
 
 export const TimeSchema = SchemaFactory.createForClass(Time);