diff --git a/htdocs/core/lib/project.lib.php b/htdocs/core/lib/project.lib.php
index 9c33744ceb0..52cbd1a68a7 100644
--- a/htdocs/core/lib/project.lib.php
+++ b/htdocs/core/lib/project.lib.php
@@ -1306,6 +1306,13 @@ function projectLinesPerDay(&$inc, $parent, $fuser, $lines, &$level, &$projectsr
 		$oldprojectforbreak = (empty($conf->global->PROJECT_TIMESHEET_DISABLEBREAK_ON_PROJECT) ? 0 : -1); // 0 to start break , -1 no break
 	}
 
+	$restrictBefore = null;
+
+	if (! empty($conf->global->PROJECT_TIMESHEET_PREVENT_AFTER_MONTHS)) {
+		require_once DOL_DOCUMENT_ROOT.'/core/lib/date.lib.php';
+		$restrictBefore = dol_time_plus_duree(dol_now(), - $conf->global->PROJECT_TIMESHEET_PREVENT_AFTER_MONTHS, 'm');
+	}
+
 	//dol_syslog('projectLinesPerDay inc='.$inc.' preselectedday='.$preselectedday.' task parent id='.$parent.' level='.$level." count(lines)=".$numlines." count(lineswithoutlevel0)=".count($lineswithoutlevel0));
 	for ($i = 0; $i < $numlines; $i++) {
 		if ($parent == 0) {
@@ -1551,6 +1558,10 @@ function projectLinesPerDay(&$inc, $parent, $fuser, $lines, &$level, &$projectsr
 					$disabledtask = 1;
 				}
 
+				if ($restrictBefore && $preselectedday < $restrictBefore) {
+					$disabledtask = 1;
+				}
+
 				// Form to add new time
 				print '<td class="nowrap leftborder center">';
 				$tableCell = $form->selectDate($preselectedday, $lines[$i]->id, 1, 1, 2, "addtime", 0, 0, $disabledtask);
@@ -1699,6 +1710,13 @@ function projectLinesPerWeek(&$inc, $firstdaytoshow, $fuser, $parent, $lines, &$
 		$oldprojectforbreak = (empty($conf->global->PROJECT_TIMESHEET_DISABLEBREAK_ON_PROJECT) ? 0 : -1); // 0 = start break, -1 = never break
 	}
 
+	$restrictBefore = null;
+
+	if (! empty($conf->global->PROJECT_TIMESHEET_PREVENT_AFTER_MONTHS)) {
+		require_once DOL_DOCUMENT_ROOT.'/core/lib/date.lib.php';
+		$restrictBefore = dol_time_plus_duree(dol_now(), - $conf->global->PROJECT_TIMESHEET_PREVENT_AFTER_MONTHS, 'm');
+	}
+
 	for ($i = 0; $i < $numlines; $i++) {
 		if ($parent == 0) {
 			$level = 0;
@@ -1977,6 +1995,12 @@ function projectLinesPerWeek(&$inc, $firstdaytoshow, $fuser, $parent, $lines, &$
 						$cssweekend = 'weekend';
 					}
 
+					$disabledtaskday = $disabledtask;
+
+					if (! $disabledtask && $restrictBefore && $tmpday < $restrictBefore) {
+						$disabledtaskday = 1;
+					}
+
 					$tableCell = '<td class="center hide'.$idw.($cssonholiday ? ' '.$cssonholiday : '').($cssweekend ? ' '.$cssweekend : '').'">';
 					//$tableCell .= 'idw='.$idw.' '.$conf->global->MAIN_START_WEEK.' '.$numstartworkingday.'-'.$numendworkingday;
 					$placeholder = '';
@@ -1985,7 +2009,7 @@ function projectLinesPerWeek(&$inc, $firstdaytoshow, $fuser, $parent, $lines, &$
 						//$placeholder=' placeholder="00:00"';
 						//$tableCell.='+';
 					}
-					$tableCell .= '<input type="text" alt="'.($disabledtask ? '' : $alttitle).'" title="'.($disabledtask ? '' : $alttitle).'" '.($disabledtask ? 'disabled' : $placeholder).' class="center smallpadd" size="2" id="timeadded['.$inc.']['.$idw.']" name="task['.$lines[$i]->id.']['.$idw.']" value="" cols="2"  maxlength="5"';
+					$tableCell .= '<input type="text" alt="'.($disabledtaskday ? '' : $alttitle).'" title="'.($disabledtaskday ? '' : $alttitle).'" '.($disabledtaskday ? 'disabled' : $placeholder).' class="center smallpadd" size="2" id="timeadded['.$inc.']['.$idw.']" name="task['.$lines[$i]->id.']['.$idw.']" value="" cols="2"  maxlength="5"';
 					$tableCell .= ' onkeypress="return regexEvent(this,event,\'timeChar\')"';
 					$tableCell .= ' onkeyup="updateTotal('.$idw.',\''.$modeinput.'\')"';
 					$tableCell .= ' onblur="regexEvent(this,event,\''.$modeinput.'\'); updateTotal('.$idw.',\''.$modeinput.'\')" />';
@@ -2079,6 +2103,13 @@ function projectLinesPerMonth(&$inc, $firstdaytoshow, $fuser, $parent, $lines, &
 		$oldprojectforbreak = (empty($conf->global->PROJECT_TIMESHEET_DISABLEBREAK_ON_PROJECT) ? 0 : -1); // 0 = start break, -1 = never break
 	}
 
+	$restrictBefore = null;
+
+	if (! empty($conf->global->PROJECT_TIMESHEET_PREVENT_AFTER_MONTHS)) {
+		require_once DOL_DOCUMENT_ROOT.'/core/lib/date.lib.php';
+		$restrictBefore = dol_time_plus_duree(dol_now(), - $conf->global->PROJECT_TIMESHEET_PREVENT_AFTER_MONTHS, 'm');
+	}
+
 	for ($i = 0; $i < $numlines; $i++) {
 		if ($parent == 0) {
 			$level = 0;
@@ -2231,10 +2262,11 @@ function projectLinesPerMonth(&$inc, $firstdaytoshow, $fuser, $parent, $lines, &
 				$modeinput = 'hours';
 				$TFirstDay = getFirstDayOfEachWeek($TWeek, date('Y', $firstdaytoshow));
 				$TFirstDay[reset($TWeek)] = 1;
-				foreach ($TFirstDay as &$fday) {
-					$fday--;
-				}
-				foreach ($TWeek as $weekNb) {
+
+				$firstdaytoshowarray = dol_getdate($firstdaytoshow);
+				$year = $firstdaytoshowarray['year'];
+				$month = $firstdaytoshowarray['mon'];
+				foreach ($TWeek as $weekIndex => $weekNb) {
 					$weekWorkLoad = $projectstatic->monthWorkLoadPerTask[$weekNb][$lines[$i]->id];
 					$totalforeachweek[$weekNb] += $weekWorkLoad;
 
@@ -2244,6 +2276,12 @@ function projectLinesPerMonth(&$inc, $firstdaytoshow, $fuser, $parent, $lines, &
 					}
 					$alttitle = $langs->trans("AddHereTimeSpentForWeek", $weekNb);
 
+					$disabledtaskweek = $disabledtask;
+					$firstdayofweek = dol_mktime(0, 0, 0, $month, $TFirstDay[$weekIndex], $year);
+
+					if (! $disabledtask && $restrictBefore && $firstdayofweek < $restrictBefore) {
+						$disabledtaskweek = 1;
+					}
 
 					$tableCell = '<td class="center hide weekend">';
 					$placeholder = '';
@@ -2253,7 +2291,7 @@ function projectLinesPerMonth(&$inc, $firstdaytoshow, $fuser, $parent, $lines, &
 						//$tableCell.='+';
 					}
 
-					$tableCell .= '<input type="text" alt="'.($disabledtask ? '' : $alttitle).'" title="'.($disabledtask ? '' : $alttitle).'" '.($disabledtask ? 'disabled' : $placeholder).' class="center smallpadd" size="2" id="timeadded['.$inc.']['.((int) $weekNb).']" name="task['.$lines[$i]->id.']['.$TFirstDay[$weekNb].']" value="" cols="2"  maxlength="5"';
+					$tableCell .= '<input type="text" alt="'.($disabledtaskweek ? '' : $alttitle).'" title="'.($disabledtaskweek ? '' : $alttitle).'" '.($disabledtaskweek ? 'disabled' : $placeholder).' class="center smallpadd" size="2" id="timeadded['.$inc.']['.((int) $weekNb).']" name="task['.$lines[$i]->id.']['.($TFirstDay[$weekNb] - 1).']" value="" cols="2"  maxlength="5"';
 					$tableCell .= ' onkeypress="return regexEvent(this,event,\'timeChar\')"';
 					$tableCell .= ' onkeyup="updateTotal('.$weekNb.',\''.$modeinput.'\')"';
 					$tableCell .= ' onblur="regexEvent(this,event,\''.$modeinput.'\'); updateTotal('.$weekNb.',\''.$modeinput.'\')" />';
diff --git a/htdocs/langs/en_US/admin.lang b/htdocs/langs/en_US/admin.lang
index b7618f64739..0273e4762e1 100644
--- a/htdocs/langs/en_US/admin.lang
+++ b/htdocs/langs/en_US/admin.lang
@@ -84,6 +84,7 @@ NumberOfBytes=Number of Bytes
 SearchString=Search string
 NotAvailableWhenAjaxDisabled=Not available when Ajax disabled
 AllowToSelectProjectFromOtherCompany=On document of a third party, can choose a project linked to another third party
+TimesheetPreventAfterFollowingMonths=Prevent recording time spent after the following number of months
 JavascriptDisabled=JavaScript disabled
 UsePreviewTabs=Use preview tabs
 ShowPreview=Show preview
diff --git a/htdocs/langs/en_US/projects.lang b/htdocs/langs/en_US/projects.lang
index 2fda7e1df0e..c5679cf5774 100644
--- a/htdocs/langs/en_US/projects.lang
+++ b/htdocs/langs/en_US/projects.lang
@@ -140,6 +140,7 @@ NoTasks=No tasks for this project
 LinkedToAnotherCompany=Linked to other third party
 TaskIsNotAssignedToUser=Task not assigned to user. Use button '<strong>%s</strong>' to assign task now.
 ErrorTimeSpentIsEmpty=Time spent is empty
+TimeRecordingRestrictedToNMonthsBack=Time recording is restricted to %s months back
 ThisWillAlsoRemoveTasks=This action will also delete all tasks of project (<b>%s</b> tasks at the moment) and all inputs of time spent.
 IfNeedToUseOtherObjectKeepEmpty=If some objects (invoice, order, ...), belonging to another third party, must be linked to the project to create, keep this empty to have the project being multi third parties.
 CloneTasks=Clone tasks
diff --git a/htdocs/projet/admin/project.php b/htdocs/projet/admin/project.php
index 288e2282a40..eaea44dd22b 100644
--- a/htdocs/projet/admin/project.php
+++ b/htdocs/projet/admin/project.php
@@ -219,6 +219,10 @@ if ($action == 'updateMaskTask') {
 		$projectToSelect = GETPOST('projectToSelect', 'alpha');
 		dolibarr_set_const($db, 'PROJECT_ALLOW_TO_LINK_FROM_OTHER_COMPANY', $projectToSelect, 'chaine', 0, '', $conf->entity); //Allow to disable this configuration if empty value
 	}
+	if (GETPOST('PROJECT_TIMESHEET_PREVENT_AFTER_MONTHS')) {
+		$timesheetFreezeDuration = GETPOST('timesheetFreezeDuration', 'alpha');
+		dolibarr_set_const($db, 'PROJECT_TIMESHEET_PREVENT_AFTER_MONTHS', intval($timesheetFreezeDuration), 'chaine', 0, '', $conf->entity); //Allow to disable this configuration if empty value
+	}
 } elseif (preg_match('/^(set|del)_?([A-Z_]+)$/', $action, $reg)) {
 	// Set boolean (on/off) constants
 	if (!dolibarr_set_const($db, $reg[2], ($reg[1] === 'set' ? '1' : '0'), 'chaine', 0, '', $conf->entity) > 0) {
@@ -797,6 +801,7 @@ print '<input type="text" id="projectToSelect" name="projectToSelect" value="'.$
 print $form->textwithpicto('', $langs->trans('AllowToLinkFromOtherCompany'));
 print '<input type="submit" class="button" name="PROJECT_ALLOW_TO_LINK_FROM_OTHER_COMPANY" value="'.$langs->trans("Modify").'">';
 print '</td>';
+print '</tr>';
 
 $key = 'PROJECT_CLASSIFY_CLOSED_WHEN_ALL_TASKS_DONE';
 echo '<tr class="oddeven">',
@@ -808,6 +813,14 @@ echo '<tr class="oddeven">',
 		'</td>',
 	'</tr>';
 
+print '<tr class="oddeven">';
+print '<td>'.$langs->trans("TimesheetPreventAfterFollowingMonths").'</td>';
+
+print '<td class="right" width="60" colspan="2">';
+print '<input type="number" id="timesheetFreezeDuration" name="timesheetFreezeDuration" min="0" step="1" value="'.$conf->global->PROJECT_TIMESHEET_PREVENT_AFTER_MONTHS.'"/>&nbsp;';
+print '<input type="submit" class="button" name="PROJECT_TIMESHEET_PREVENT_AFTER_MONTHS" value="'.$langs->trans("Modify").'">';
+print '</td>';
+print '</tr>';
 print '</table>';
 
 
diff --git a/htdocs/projet/class/task.class.php b/htdocs/projet/class/task.class.php
index 9f81218ba8d..5967fffa00a 100644
--- a/htdocs/projet/class/task.class.php
+++ b/htdocs/projet/class/task.class.php
@@ -1158,6 +1158,18 @@ class Task extends CommonObject
 			$this->timespent_datehour = $this->timespent_date;
 		}
 
+        if (! empty($conf->global->PROJECT_TIMESHEET_PREVENT_AFTER_MONTHS)) {
+            require_once DOL_DOCUMENT_ROOT.'/core/lib/date.lib.php';
+            $restrictBefore = dol_time_plus_duree(dol_now(), - $conf->global->PROJECT_TIMESHEET_PREVENT_AFTER_MONTHS, 'm');
+
+            if ($this->timespent_date < $restrictBefore) {
+                $this->error = $langs->trans('TimeRecordingRestrictedToNMonthsBack', $conf->global->PROJECT_TIMESHEET_PREVENT_AFTER_MONTHS);
+                $this->errors[] = $this->error;
+                return -1;
+            }
+        }
+
+
 		$this->db->begin();
 
 		$sql = "INSERT INTO ".MAIN_DB_PREFIX."projet_task_time (";