diff --git a/backend/packages/Upgrade/src/api/controllers/ExperimentController.ts b/backend/packages/Upgrade/src/api/controllers/ExperimentController.ts
index 5e84e0ab49..a65f595e9c 100644
--- a/backend/packages/Upgrade/src/api/controllers/ExperimentController.ts
+++ b/backend/packages/Upgrade/src/api/controllers/ExperimentController.ts
@@ -1093,7 +1093,7 @@ export class ExperimentController {
    * @swagger
    * /experiments/{id}:
    *    put:
-   *       description: Create New Experiment
+   *       description: Update Experiment
    *       consumes:
    *         - application/json
    *       parameters:
diff --git a/backend/packages/Upgrade/src/api/services/ExperimentAssignmentService.ts b/backend/packages/Upgrade/src/api/services/ExperimentAssignmentService.ts
index 243d8bdbab..1a36054329 100644
--- a/backend/packages/Upgrade/src/api/services/ExperimentAssignmentService.ts
+++ b/backend/packages/Upgrade/src/api/services/ExperimentAssignmentService.ts
@@ -50,7 +50,6 @@ import isequal from 'lodash.isequal';
 import flatten from 'lodash.flatten';
 import { ILogInput, ENROLLMENT_CODE } from 'upgrade_types';
 import { StateTimeLogsRepository } from '../repositories/StateTimeLogsRepository';
-import { StateTimeLog } from '../models/StateTimeLogs';
 import { UpgradeLogger } from '../../lib/logger/UpgradeLogger';
 import { SegmentService } from './SegmentService';
 import { MonitoredDecisionPointLogRepository } from '../repositories/MonitoredDecisionPointLogRepository';
@@ -1067,17 +1066,14 @@ export class ExperimentAssignmentService {
   private async checkEnrollmentEndingCriteriaForCount(experiment: Experiment, logger: UpgradeLogger): Promise<void> {
     const { enrollmentCompleteCondition } = experiment;
     const { groupCount, userCount } = enrollmentCompleteCondition;
-
-    const timeLogDate = new Date();
     /**
      * Create stateTimeLog document which will be inserted if ending criteria is met
      */
-    const stateTimeLogDoc = new StateTimeLog();
-    stateTimeLogDoc.id = uuid();
-    stateTimeLogDoc.fromState = experiment.state;
-    stateTimeLogDoc.toState = EXPERIMENT_STATE.ENROLLMENT_COMPLETE;
-    stateTimeLogDoc.timeLog = timeLogDate;
-    stateTimeLogDoc.experiment = experiment;
+    const stateTimeLogDoc = await this.experimentService.prepareStateTimeLogDoc(
+      experiment,
+      experiment.state,
+      EXPERIMENT_STATE.ENROLLMENT_COMPLETE
+    );
 
     if (groupCount && userCount && experiment.assignmentUnit === ASSIGNMENT_UNIT.GROUP) {
       const groupSatisfied: number = await this.getGroupAssignmentStatus(experiment.id, logger);
diff --git a/backend/packages/Upgrade/src/api/services/ExperimentService.ts b/backend/packages/Upgrade/src/api/services/ExperimentService.ts
index c872392117..084d03e5d5 100644
--- a/backend/packages/Upgrade/src/api/services/ExperimentService.ts
+++ b/backend/packages/Upgrade/src/api/services/ExperimentService.ts
@@ -403,6 +403,20 @@ export class ExperimentService {
     return [...conditionIds, ...decisionPointsIds];
   }
 
+  public async prepareStateTimeLogDoc(
+    experimentDoc: Experiment,
+    fromState: EXPERIMENT_STATE,
+    toState: EXPERIMENT_STATE
+  ) {
+    const stateTimeLogDoc = new StateTimeLog();
+    stateTimeLogDoc.id = uuid();
+    stateTimeLogDoc.fromState = fromState;
+    stateTimeLogDoc.toState = toState;
+    stateTimeLogDoc.timeLog = new Date();
+    stateTimeLogDoc.experiment = experimentDoc;
+    return stateTimeLogDoc;
+  }
+
   public async updateState(
     experimentId: string,
     state: EXPERIMENT_STATE,
@@ -459,14 +473,7 @@ export class ExperimentService {
     // add experiment audit logs
     await this.experimentAuditLogRepository.saveRawJson(LOG_TYPE.EXPERIMENT_STATE_CHANGED, data, user, entityManager);
 
-    const timeLogDate = new Date();
-
-    const stateTimeLogDoc = new StateTimeLog();
-    stateTimeLogDoc.id = uuid();
-    stateTimeLogDoc.fromState = oldExperiment.state;
-    stateTimeLogDoc.toState = state;
-    stateTimeLogDoc.timeLog = timeLogDate;
-    stateTimeLogDoc.experiment = oldExperiment;
+    const stateTimeLogDoc = await this.prepareStateTimeLogDoc(oldExperiment, oldExperiment.state, state);
 
     // updating the experiment and stateTimeLog
     const stateTimeLogRepo = entityManager ? entityManager.getRepository(StateTimeLog) : this.stateTimeLogsRepository;
@@ -785,6 +792,13 @@ export class ExperimentService {
         let experimentDoc: Experiment;
         try {
           experimentDoc = await transactionalEntityManager.getRepository(Experiment).save(expDoc);
+          // Store state time log for the experiment
+          const stateTimeLogDoc = await this.prepareStateTimeLogDoc(
+            experimentDoc,
+            oldExperiment.state,
+            experimentDoc.state
+          );
+          await transactionalEntityManager.getRepository(StateTimeLog).save(stateTimeLogDoc);
         } catch (err) {
           const error = err as ErrorWithType;
           error.details = `Error in updating experiment document "updateExperimentInDB"`;
@@ -1228,6 +1242,15 @@ export class ExperimentService {
       let experimentDoc: Experiment;
       try {
         experimentDoc = await transactionalEntityManager.getRepository(Experiment).save(expDoc);
+        // Store state time log for the experiment in enrolling state.
+        if (experimentDoc.state !== EXPERIMENT_STATE.INACTIVE) {
+          const stateTimeLogDoc = await this.prepareStateTimeLogDoc(
+            experimentDoc,
+            EXPERIMENT_STATE.INACTIVE,
+            experimentDoc.state
+          );
+          await transactionalEntityManager.getRepository(StateTimeLog).save(stateTimeLogDoc);
+        }
       } catch (err) {
         const error = err as ErrorWithType;
         error.details = 'Error in adding experiment in DB';