diff --git a/i18n/en.ts b/i18n/en.ts
index 7ee8aabd73a1ecb08832d5253a8c38ef1c27bf58..c59190e1c683973b9445f513a18aaf4208c8d41d 100644
--- a/i18n/en.ts
+++ b/i18n/en.ts
@@ -41,6 +41,7 @@ export const lang_en: LangObj = {
   "Discard": "Discard",
   "Created at": "Created at",
   "Last updated at": "Last updated at",
+  "First accessed at": "First accessed at",
   "Last login at": "Last login at",
   "Information": "Information",
   "Search": "Search",
diff --git a/i18n/i18nRoot.ts b/i18n/i18nRoot.ts
index 0fdaa5e9656337501586e3611822741505cb6501..23287e2349384e3ae8ccce20d8acc25701183ef5 100644
--- a/i18n/i18nRoot.ts
+++ b/i18n/i18nRoot.ts
@@ -44,6 +44,7 @@ export interface LangObj {
   "Discard": string
   "Created at": string
   "Last updated at": string
+  "First accessed at": string
   "Last login at": string
   "Information": string
   "Search": string
diff --git a/src/components/sites/allAccessibleExercisesSite/closedExercisesSite/listView.tsx b/src/components/sites/allAccessibleExercisesSite/closedExercisesSite/listView.tsx
index a675b14adcfde08871f56903cb2cd23c205a4d9c..a5ea95456b91001017332e2c1faeb5525fdedf0f 100644
--- a/src/components/sites/allAccessibleExercisesSite/closedExercisesSite/listView.tsx
+++ b/src/components/sites/allAccessibleExercisesSite/closedExercisesSite/listView.tsx
@@ -131,6 +131,50 @@ class AllAccessibleExercisesList extends React.Component<Props, any> {
                   }
                 </span>
               </Table.HeaderCell>
+              <Table.HeaderCell
+                sorted={
+                  isCurrentSortingColumnPaginated<ExercisePreviewFromBackend>(this.props.sortByKey, 'lastUpdatedAt',
+                    this.props.sortDirection)
+                }
+              >
+                <span className="clickable"
+                      onClick={() => {
+                        this.props.setSortByKey('lastUpdatedAt',
+                          rotateSorting<ExercisePreviewFromBackend>(this.props.sortDirection,
+                            this.props.sortByKey,
+                            'lastUpdatedAt',
+                          ),
+                          this.props.displayAsViaCode
+                        )
+                      }}
+                >
+                  {
+                    getI18n(this.props.langId,'Last updated at')
+                  }
+                </span>
+              </Table.HeaderCell>
+              <Table.HeaderCell
+                sorted={
+                  isCurrentSortingColumnPaginated<ExercisePreviewFromBackend>(this.props.sortByKey, 'firstAccessedAt',
+                    this.props.sortDirection)
+                }
+              >
+                <span className="clickable"
+                      onClick={() => {
+                        this.props.setSortByKey('firstAccessedAt',
+                          rotateSorting<ExercisePreviewFromBackend>(this.props.sortDirection,
+                            this.props.sortByKey,
+                            'firstAccessedAt',
+                          ),
+                          this.props.displayAsViaCode
+                        )
+                      }}
+                >
+                  {
+                    getI18n(this.props.langId,'First accessed at')
+                  }
+                </span>
+              </Table.HeaderCell>
               <Table.HeaderCell>
                 <span>
                   <HelpPopup icon="flag outline"
@@ -199,6 +243,20 @@ class AllAccessibleExercisesList extends React.Component<Props, any> {
                       <HelpPopup defaultText={exercisePreview.shortDescription}/>
                       }
                     </Table.Cell>
+                    <Table.Cell>
+                      <span>
+                        {
+                          displayDateAndTime(exercisePreview.lastUpdatedAt, -1)
+                        }
+                      </span>
+                    </Table.Cell>
+                    <Table.Cell>
+                      <span>
+                        {
+                          displayDateAndTime(exercisePreview.firstAccessedAt, -1)
+                        }
+                      </span>
+                    </Table.Cell>
                     <Table.Cell>
                       <div>
                         <Checkbox checked={exercisePreview.shouldNotCount} disabled/>
diff --git a/src/components/sites/allAccessibleExercisesSite/openExercises/listView.tsx b/src/components/sites/allAccessibleExercisesSite/openExercises/listView.tsx
index 2ae023cf507d93bf67b44e53cb37b5aa2ca4e918..ab2972ae140736381fe1d20afee4fe09751fbfc0 100644
--- a/src/components/sites/allAccessibleExercisesSite/openExercises/listView.tsx
+++ b/src/components/sites/allAccessibleExercisesSite/openExercises/listView.tsx
@@ -133,6 +133,50 @@ class AllAccessibleExercisesList extends React.Component<Props, any> {
                   }
                 </span>
               </Table.HeaderCell>
+              <Table.HeaderCell
+                sorted={
+                  isCurrentSortingColumnPaginated<ExercisePreviewFromBackend>(this.props.sortByKey, 'lastUpdatedAt',
+                    this.props.sortDirection)
+                }
+              >
+                <span className="clickable"
+                      onClick={() => {
+                        this.props.setSortByKey('lastUpdatedAt',
+                          rotateSorting<ExercisePreviewFromBackend>(this.props.sortDirection,
+                            this.props.sortByKey,
+                            'lastUpdatedAt',
+                          ),
+                          this.props.displayAsViaCode
+                        )
+                      }}
+                >
+                  {
+                    getI18n(this.props.langId,'Last updated at')
+                  }
+                </span>
+              </Table.HeaderCell>
+              <Table.HeaderCell
+                sorted={
+                  isCurrentSortingColumnPaginated<ExercisePreviewFromBackend>(this.props.sortByKey, 'firstAccessedAt',
+                    this.props.sortDirection)
+                }
+              >
+                <span className="clickable"
+                      onClick={() => {
+                        this.props.setSortByKey('firstAccessedAt',
+                          rotateSorting<ExercisePreviewFromBackend>(this.props.sortDirection,
+                            this.props.sortByKey,
+                            'firstAccessedAt',
+                          ),
+                          this.props.displayAsViaCode
+                        )
+                      }}
+                >
+                  {
+                    getI18n(this.props.langId,'First accessed at')
+                  }
+                </span>
+              </Table.HeaderCell>
               {
                 this.props.hideShouldNotCountColumn === false &&
                 <Table.HeaderCell>
@@ -168,9 +212,8 @@ class AllAccessibleExercisesList extends React.Component<Props, any> {
               }
               <Table.HeaderCell>
                 <span>
-                  {
-                    getI18n(this.props.langId,'Working time in min')
-                  }
+                  <HelpPopup icon="wait"
+                             defaultText={getI18n(this.props.langId,'Working time in min')}/>
                 </span>
               </Table.HeaderCell>
               <Table.HeaderCell>
@@ -214,6 +257,20 @@ class AllAccessibleExercisesList extends React.Component<Props, any> {
                       <HelpPopup defaultText={exercisePreview.shortDescription}/>
                       }
                     </Table.Cell>
+                    <Table.Cell>
+                      <span>
+                        {
+                          displayDateAndTime(exercisePreview.lastUpdatedAt, -1)
+                        }
+                      </span>
+                    </Table.Cell>
+                    <Table.Cell>
+                      <span>
+                        {
+                          displayDateAndTime(exercisePreview.firstAccessedAt, -1)
+                        }
+                      </span>
+                    </Table.Cell>
                     {
                       this.props.hideShouldNotCountColumn === false &&
                       <Table.Cell>
diff --git a/src/components/sites/doExerciseSite/doExerciseSite.tsx b/src/components/sites/doExerciseSite/doExerciseSite.tsx
index 3d4e39210a9f1a76f0327ab0bb155ee4d6e3ddd6..94f0d86d15be317eae2f71caec43398ffab726aa 100644
--- a/src/components/sites/doExerciseSite/doExerciseSite.tsx
+++ b/src/components/sites/doExerciseSite/doExerciseSite.tsx
@@ -911,6 +911,7 @@ class doExerciseSite extends React.Component<Props & RouteComponentProps<Matched
       hasLimitedWorkingTime: this.props.doExercise.exerciseRelease.hasLimitedWorkingTime,
       availableWorkingTimeInMinutes: this.props.doExercise.exerciseRelease.availableWorkingTimeInMinutes,
       firstAccessedAt: this.props.doExercise.firstAccessedAt,
+      lastUpdatedAt: null, //not needed or known here
       shortDescription: '',
       shouldNotCount: false,
       releaseDurationType: this.props.doExercise.exerciseRelease.releaseDurationType,
diff --git a/src/types/exercisePreview.ts b/src/types/exercisePreview.ts
index ac704e8c2c334637f9dd2af587c5f5623fb0e17e..114e92fa154c43ed005ab285488fb4151682cede 100644
--- a/src/types/exercisePreview.ts
+++ b/src/types/exercisePreview.ts
@@ -100,9 +100,17 @@ export interface ExercisePreviewFromBackend {
    * (not actually accessed but could have accessed e.g. wehn he/she enters the release code)
    * used to calculate the left working time...
    * can be null because when accessed without code we know nothing about the (future) participation
+   * e.g. it is displayed in the visible for all area but the user has no participation for it
    */
   readonly firstAccessedAt: Moment | null
 
+  /**
+   * the date time when the user last edited the exercise (e.g. created custom test, changed solution code)
+   * can be null because when accessed without code we know nothing about the (future) participation
+   * e.g. it is displayed in the visible for all area but the user has no participation for it
+   */
+  readonly lastUpdatedAt: Moment | null
+
   /**
    * true: is still released,false: not
    */