diff --git a/src/datasources/db/lendingstationAPI.ts b/src/datasources/db/lendingstationAPI.ts
index ed5fc44..c371cff 100644
--- a/src/datasources/db/lendingstationAPI.ts
+++ b/src/datasources/db/lendingstationAPI.ts
@@ -1,6 +1,6 @@
 import { DataSource } from 'apollo-datasource';
 import { GraphQLError } from 'graphql';
-import { Connection, getConnection } from 'typeorm';
+import { Connection, EntityManager, getConnection } from 'typeorm';
 import { CargoBike } from '../../model/CargoBike';
 import { LendingStation } from '../../model/LendingStation';
 import { TimeFrame } from '../../model/TimeFrame';
@@ -42,6 +42,15 @@ export class LendingStationAPI extends DataSource {
             .getOne().catch(() => { return null; });
     }
 
+    async timeFrames (offset: number, limit: number) {
+        return await this.connection.getRepository(TimeFrame)
+            .createQueryBuilder('timeframe')
+            .select()
+            .offset(offset)
+            .limit(limit)
+            .getMany() || [];
+    }
+
     async timeFramesByLendingStationId (id: number) {
         return await this.connection.getRepository(TimeFrame)
             .createQueryBuilder('timeFrame')
@@ -115,4 +124,32 @@ export class LendingStationAPI extends DataSource {
             return new GraphQLError('ID not in database');
         }
     }
+
+    async createTimeFrame (timeFrame: any) {
+        let inserts: any;
+        await this.connection.transaction(async (entityManager: EntityManager) => {
+            if (timeFrame.to === undefined) {
+                timeFrame.to = '';
+            }
+            timeFrame.dateRange = '[' + timeFrame.from + ',' + timeFrame.to + ')';
+            inserts = await entityManager.getRepository(TimeFrame)
+                .createQueryBuilder('timeframe')
+                .insert()
+                .returning('*')
+                .values([timeFrame])
+                .execute();
+            await entityManager.getRepository(TimeFrame)
+                .createQueryBuilder()
+                .relation(TimeFrame, 'cargoBike')
+                .of(inserts.identifiers[0].id)
+                .set(timeFrame.cargoBikeId);
+            await entityManager.getRepository(TimeFrame)
+                .createQueryBuilder()
+                .relation(TimeFrame, 'lendingStation')
+                .of(inserts.identifiers[0].id)
+                .set(timeFrame.lendingStationId);
+        });
+        inserts.generatedMaps[0].id = inserts.identifiers[0].id;
+        return inserts.generatedMaps[0];
+    }
 }
diff --git a/src/resolvers/lendingstationResolvers.ts b/src/resolvers/lendingstationResolvers.ts
index 201c732..7b43d0f 100644
--- a/src/resolvers/lendingstationResolvers.ts
+++ b/src/resolvers/lendingstationResolvers.ts
@@ -17,6 +17,13 @@ export default {
             } else {
                 return new GraphQLError('Insufficient Permissions');
             }
+        },
+        timeframes: (_: any, { offset, limit }: { offset: number, limit: number }, { dataSources, req }: { dataSources: any, req: any }) => {
+            if (req.permissions.includes(Permission.ReadBike)) {
+                return dataSources.lendingStationAPI.timeFrames(offset, limit);
+            } else {
+                return new GraphQLError('Insufficient Permissions');
+            }
         }
     },
     LendingStation: {
@@ -33,6 +40,14 @@ export default {
             return dataSources.lendingStationAPI.cargoBikesByLendingStationId(parent.id);
         }
     },
+    TimeFrame: {
+        from (parent: any, __: any, { dataSources, req }: { dataSources: any, req: any }) {
+            return (parent.dateRange as string).split(',')[0].replace('[', '');
+        },
+        to (parent: any, __: any, { dataSources, req }: { dataSources: any, req: any }) {
+            return (parent.dateRange as string).split(',')[1].replace(')', '');
+        }
+    },
     Mutation: {
         createLendingStation: (_: any, { lendingStation }:{ lendingStation: LendingStation }, { dataSources, req }:{dataSources: any, req: any }) => {
             if (req.permissions.includes(Permission.WriteBike)) {
@@ -47,6 +62,13 @@ export default {
             } else {
                 return new GraphQLError('Insufficient Permissions');
             }
+        },
+        createTimeFrame: (_: any, { timeFrame }:{ timeFrame: LendingStation }, { dataSources, req }:{dataSources: any, req: any }) => {
+            if (req.permissions.includes(Permission.WriteBike)) {
+                return dataSources.lendingStationAPI.createTimeFrame(timeFrame);
+            } else {
+                return new GraphQLError('Insufficient Permissions');
+            }
         }
     }
 };
diff --git a/src/schema/type-defs.ts b/src/schema/type-defs.ts
index 6a1fc29..4b4da45 100644
--- a/src/schema/type-defs.ts
+++ b/src/schema/type-defs.ts
@@ -656,7 +656,7 @@ input LoanPeriodsInput {
     times: [String]
 }
 
-"(dt. Zeitscheibe)"
+"(dt. Zeitscheibe) When was a bike where"
 type TimeFrame {
     id: ID!
     from: Date!
@@ -667,11 +667,11 @@ type TimeFrame {
 }
 
 input TimeFrameCreateInput {
-    from: Date
+    from: Date!
     to: Date
     note: String
-    lendingStationID: LendingStationCreateInput
-    cargoBikeID: CargoBikeCreateInput
+    lendingStationID: ID!
+    cargoBikeID: ID!
 }
 
 input TimeFrameUpdateInput {
@@ -679,8 +679,9 @@ input TimeFrameUpdateInput {
     from: Date
     to: Date
     note: String
-    lendingStation: LendingStationUpdateInput
-    cargoBike: CargoBikeUpdateInput
+    lendingStation: ID
+    cargoBike: ID
+    keepLock: Boolean
 }
 
 type Address {
@@ -719,6 +720,7 @@ type Query {
     participants(offset: Int!, limit: Int!): [ Participant]!
     lendingStationById(id:ID!): LendingStation
     lendingStations(offset: Int!, limit: Int!): [LendingStation]!
+    timeframes(offset: Int!, limit: Int!): [TimeFrame]!
     contactInformation(offset: Int!, limit: Int!): [ContactInformation]!
     "returns BikeEvent with CargoBike"
     bikeEventById(id:ID!): BikeEvent!
@@ -745,6 +747,7 @@ type Mutation {
     createLendingStation(lendingStation: LendingStationCreateInput): LendingStation!
     "updates lendingStation of given ID with supplied fields and returns updated lendingStation"
     updateLendingStation(lendingstation: LendingStationUpdateInput!): LendingStation!
+    createTimeFrame(timeFrame: TimeFrameCreateInput!): TimeFrame!
     "creates new BikeEvent"
     createBikeEvent(bikeEvent: BikeEventCreateInput): BikeEvent!
     "create participant"