diff --git a/amd/build/page_info.min.js b/amd/build/page_info.min.js
index fa0e2b8..7e7da74 100644
--- a/amd/build/page_info.min.js
+++ b/amd/build/page_info.min.js
@@ -1 +1 @@
-define([],function(){var a={failGrades:!1,incompleteGrades:!1,defaultIncomplete:!1,lastAttendDates:!1,incompleteDeadlineDates:!1,gradeModes:!1,init:function(a,b,c,d,e){this.failGrades=a,this.incompleteGrades=b,this.defaultIncomplete=c,this.incompleteDeadlineDates={start:new Date(d.start),userstart:d.userstart,end:new Date(d.end),userend:d.userend},this.lastAttendDates={start:new Date(e.start),userstart:e.userstart,end:new Date(e.end),userend:e.userend}},gradeIsIncomplete:function(a){return!!this.incompleteGrades.hasOwnProperty(a)},gradeIsFailure:function(a){return!!this.failGrades.hasOwnProperty(a)},isAllowedIncompleteGrade:function(a){return!(!a||this.gradeIsIncomplete(a))},isAllowedIncompleteDeadline:function(a){var b=new Date(a);return!(b<this.incompleteDeadlineDates.start)&&!(b>this.incompleteDeadlineDates.end)},isAllowedLastAttendDate:function(a){var b=new Date(a);return!(b<this.lastAttendDates.start)&&!(b>this.lastAttendDates.end)},getStringLastAttendDates:function(){return{start:this.lastAttendDates.userstart,end:this.lastAttendDates.userend}},getStringIncompleteDeadline:function(){return{start:this.incompleteDeadlineDates.userstart,end:this.incompleteDeadlineDates.userend}},getIncompleteGrade:function(){return"F"}};return a});
\ No newline at end of file
+define([],function(){var a={failGrades:!1,incompleteGrades:!1,defaultIncomplete:!1,lastAttendDates:!1,incompleteDeadlineDates:!1,gradeModes:!1,init:function(a,b,c,d,e){this.failGrades=a,this.incompleteGrades=b,this.defaultIncomplete=c;var f=d.start;f!==!1&&(f=new Date(f));var g=d.end;g!==!1&&(g=new Date(g)),this.incompleteDeadlineDates={start:f,userstart:d.userstart,end:g,userend:d.userend},this.lastAttendDates={start:new Date(e.start),userstart:e.userstart,end:new Date(e.end),userend:e.userend}},gradeIsIncomplete:function(a){return!!this.incompleteGrades.hasOwnProperty(a)},gradeIsFailure:function(a){return!!this.failGrades.hasOwnProperty(a)},isAllowedIncompleteGrade:function(a){return!(!a||this.gradeIsIncomplete(a))},isAllowedIncompleteDeadline:function(a){var b=new Date(a).getTime(),c=this.incompleteDeadlineDates.start.getTime();return!(this.incompleteDeadlineDates.start!==!1&&b<c)&&!(this.incompleteDeadlineDates.end!==!1&&b>this.incompleteDeadlineDates.end.getTime())},isAllowedLastAttendDate:function(a){var b=new Date(a);return!(b<this.lastAttendDates.start)&&!(b>this.lastAttendDates.end)},getStringLastAttendDates:function(){return{start:this.lastAttendDates.userstart,end:this.lastAttendDates.userend}},getIncompleteDeadlineStringName:function(){return this.incompleteDeadlineDates.start===!1?"invalid_incomplete_date_end":this.incompleteDeadlineDates.end===!1?"invalid_incomplete_date_start":this.incompleteDeadlineDates.start.getTime()===this.incompleteDeadlineDates.end.getTime()?"invalid_incomplete_date_single":"invalid_incomplete_date_range"},getStringIncompleteDeadline:function(){return{start:this.incompleteDeadlineDates.userstart,end:this.incompleteDeadlineDates.userend}},getIncompleteGrade:function(){return"F"}};return a});
\ No newline at end of file
diff --git a/amd/build/row_control.min.js b/amd/build/row_control.min.js
index 01973e2..2c358ea 100644
--- a/amd/build/row_control.min.js
+++ b/amd/build/row_control.min.js
@@ -1 +1 @@
-define(["jquery","gradeexport_ilp_push/page_info","core/ajax","core/notification","core/templates","core/str","core/log"],function(a,b,c,d,e,f,g){var h={failGrades:!1,incompleteGrades:!1,initAll:function(){a(".gradingtable .usergraderow").each(function(){h.initRow(a(this))})},initRow:function(c){var d=c.find(".gradeselect").eq(0);d.change(function(){var d=a(this).val();b.gradeIsIncomplete(d)?(c.find(".incomplete").show(),c.find(".fail").hide()):b.gradeIsFailure(d)?(c.find(".incomplete").hide(),c.find(".fail").show()):(c.find(".incomplete").hide(),c.find(".fail").hide()),h.updateVerification(c)}),c.find(".incompletedeadline input").eq(0).change(function(){h.updateVerification(c)}),c.find(".datelastattended input").eq(0).change(function(){h.updateVerification(c)}),c.find(".incompletegradeselect").eq(0).change(function(){h.updateVerification(c)}),c.find(".grademode .currentgrademode").eq(0).click(function(){h.showGradeModeSelector(c)}),c.find(".grademode .grademodeselect").eq(0).change(function(){h.changeGradeMode(c)}),c.find(".grademode .grademodeselect").eq(0).focusout(function(){h.hideGradeModeSelector(c)}),c.find(".togglehistory a").eq(0).click(function(a){a.preventDefault(),h.toggleHistory(c)}),h.updateVerification(c)},updateFormWarning:function(a,b,c,d){var h=a.find(b);if(h)return h=h.eq(0),c?void f.get_string(c,"gradeexport_ilp_push",d).done(function(a){e.renderPix("i/warning","core",a).then(function(a){h.html(a)}).fail(function(){g.debug("Failed to fetch the warning icon")})}):void h.html("")},updateVerification:function(a){if(!a.hasClass("locked")){var c=a.find(".gradeselect").eq(0),d=c.val(),e=a.find(".confirmcheckbox").eq(0),f=a.find(".grade .letter").eq(0).data("grade-key"),g=a.find(".grade .notequal").eq(0);f!=d?g.show():g.hide();var i=!1,j=!1,k="";if(d||(j=!0,k="invalid_grade"),h.updateFormWarning(a,".gradeerror",k),b.gradeIsIncomplete(d)){i=a.find(".incompletedeadline input").eq(0),k="",""==i.val()?(j=!0,k="invalid_incomplete_date"):b.isAllowedIncompleteDeadline(i.val())||(j=!0,k="invalid_incomplete_date"),h.updateFormWarning(a,".incompletedateerror",k,b.getStringIncompleteDeadline());var l=a.find(".incompletegradeselect").eq(0);k="",l.val()?b.isAllowedIncompleteGrade(l.val())||(j=!0,k="invalid_incomplete_grade_wrong"):(j=!0,k="invalid_incomplete_grade_missing"),h.updateFormWarning(a,".incompletegradeerror",k,b.getIncompleteGrade())}else b.gradeIsFailure(d)&&(i=a.find(".datelastattended input").eq(0),k="",""==i.val()?(j=!0,k="invalid_datelastattended"):b.isAllowedLastAttendDate(i.val())||(j=!0,k="invalid_datelastattended"),h.updateFormWarning(a,".datelastattendederror",k,b.getStringLastAttendDates()));j?e.prop("disabled",!0):e.prop("disabled",!1)}},showGradeModeSelector:function(a){var b=a.find(".grademode .currentgrademode"),c=a.find(".grademode .grademodeselect");b.hide(),c.show()},hideGradeModeSelector:function(a){var b=a.find(".grademode .currentgrademode"),c=a.find(".grademode .grademodeselect");b.show(),c.hide()},changeGradeMode:function(b){var f=b.find(".grademode .currentgrademode"),g=b.find(".grademode .grademodeselect"),i=g.find("select").eq(0).val(),j=b.data("user-id"),k=b.data("row-id"),l=b.closest("form").find('input[name="courseid"]').val();c.call([{methodname:"gradeexport_ilp_push_update_row_grade_mode",args:{rowid:k,grademodeid:i,studentid:j,courseid:l},done:function(c){return c.warnings.length>0?(d.alert(c.warnings[0].message,c.warnings[0].item),f.show(),void g.hide()):void e.render("gradeexport_ilp_push/user_row",JSON.parse(c.rowdata)).then(function(c,d){return b.siblings('tr[data-row-id="'+k+'"]').remove(),e.replaceNode(b,c,d),b=a('.gradingtable .usergraderow[data-row-id="'+k+'"]').eq(0),h.initRow(b),null}).fail(function(a){d.exception(a)})},fail:d.exception}])},toggleHistory:function(b){var c=a("#historyrow-"+b.data("row-id")+" td.historycell"),d=c.find(".historydiv");c.is(":hidden")?(c.slideDown(100),d.slideDown(400)):(d.animate({height:0},400,function(){d.hide(),d.height("auto")}),c.hide(400))}};return h});
\ No newline at end of file
+define(["jquery","gradeexport_ilp_push/page_info","core/ajax","core/notification","core/templates","core/str","core/log"],function(a,b,c,d,e,f,g){var h={failGrades:!1,incompleteGrades:!1,initAll:function(){a(".gradingtable .usergraderow").each(function(){h.initRow(a(this))})},initRow:function(c){var d=c.find(".gradeselect").eq(0);d.change(function(){var d=a(this).val();b.gradeIsIncomplete(d)?(c.find(".incomplete").show(),c.find(".fail").hide()):b.gradeIsFailure(d)?(c.find(".incomplete").hide(),c.find(".fail").show()):(c.find(".incomplete").hide(),c.find(".fail").hide()),h.updateVerification(c)}),c.find(".incompletedeadline input").eq(0).change(function(){h.updateVerification(c)}),c.find(".datelastattended input").eq(0).change(function(){h.updateVerification(c)}),c.find(".incompletegradeselect").eq(0).change(function(){h.updateVerification(c)}),c.find(".grademode .currentgrademode").eq(0).click(function(){h.showGradeModeSelector(c)}),c.find(".grademode .grademodeselect").eq(0).change(function(){h.changeGradeMode(c)}),c.find(".grademode .grademodeselect").eq(0).focusout(function(){h.hideGradeModeSelector(c)}),c.find(".togglehistory a").eq(0).click(function(a){a.preventDefault(),h.toggleHistory(c)}),h.updateVerification(c)},updateFormWarning:function(a,b,c,d){var h=a.find(b);if(h)return h=h.eq(0),c?void f.get_string(c,"gradeexport_ilp_push",d).done(function(a){e.renderPix("i/warning","core",a).then(function(a){h.html(a)}).fail(function(){g.debug("Failed to fetch the warning icon")})}):void h.html("")},updateVerification:function(a){if(!a.hasClass("locked")){var c=a.find(".gradeselect").eq(0),d=c.val(),e=a.find(".confirmcheckbox").eq(0),f=a.find(".grade .letter").eq(0).data("grade-key"),g=a.find(".grade .notequal").eq(0);f!=d?g.show():g.hide();var i=!1,j=!1,k="";if(d||(j=!0,k="invalid_grade"),h.updateFormWarning(a,".gradeerror",k),b.gradeIsIncomplete(d)){i=a.find(".incompletedeadline input").eq(0),k="",""==i.val()?(j=!0,k="invalid_incomplete_date"):b.isAllowedIncompleteDeadline(i.val())||(j=!0,k="invalid_incomplete_date"),""!=k&&(k=b.getIncompleteDeadlineStringName()),h.updateFormWarning(a,".incompletedateerror",k,b.getStringIncompleteDeadline());var l=a.find(".incompletegradeselect").eq(0);k="",l.val()?b.isAllowedIncompleteGrade(l.val())||(j=!0,k="invalid_incomplete_grade_wrong"):(j=!0,k="invalid_incomplete_grade_missing"),h.updateFormWarning(a,".incompletegradeerror",k,b.getIncompleteGrade())}else b.gradeIsFailure(d)&&(i=a.find(".datelastattended input").eq(0),k="",""==i.val()?(j=!0,k="invalid_datelastattended"):b.isAllowedLastAttendDate(i.val())||(j=!0,k="invalid_datelastattended"),h.updateFormWarning(a,".datelastattendederror",k,b.getStringLastAttendDates()));j?e.prop("disabled",!0):e.prop("disabled",!1)}},showGradeModeSelector:function(a){var b=a.find(".grademode .currentgrademode"),c=a.find(".grademode .grademodeselect");b.hide(),c.show()},hideGradeModeSelector:function(a){var b=a.find(".grademode .currentgrademode"),c=a.find(".grademode .grademodeselect");b.show(),c.hide()},changeGradeMode:function(b){var f=b.find(".grademode .currentgrademode"),g=b.find(".grademode .grademodeselect"),i=g.find("select").eq(0).val(),j=b.data("user-id"),k=b.data("row-id"),l=b.closest("form").find('input[name="courseid"]').val();c.call([{methodname:"gradeexport_ilp_push_update_row_grade_mode",args:{rowid:k,grademodeid:i,studentid:j,courseid:l},done:function(c){return c.warnings.length>0?(d.alert(c.warnings[0].message,c.warnings[0].item),f.show(),void g.hide()):void e.render("gradeexport_ilp_push/user_row",JSON.parse(c.rowdata)).then(function(c,d){return b.siblings('tr[data-row-id="'+k+'"]').remove(),e.replaceNode(b,c,d),b=a('.gradingtable .usergraderow[data-row-id="'+k+'"]').eq(0),h.initRow(b),null}).fail(function(a){d.exception(a)})},fail:d.exception}])},toggleHistory:function(b){var c=a("#historyrow-"+b.data("row-id")+" td.historycell"),d=c.find(".historydiv");c.is(":hidden")?(c.slideDown(100),d.slideDown(400)):(d.animate({height:0},400,function(){d.hide(),d.height("auto")}),c.hide(400))}};return h});
\ No newline at end of file
diff --git a/amd/src/page_info.js b/amd/src/page_info.js
index bcf9f7a..4ed569c 100644
--- a/amd/src/page_info.js
+++ b/amd/src/page_info.js
@@ -37,9 +37,19 @@ define([], function() {
             this.failGrades = failGrades;
             this.incompleteGrades = incompleteGrades;
             this.defaultIncomplete = defaultIncomplete;
-            this.incompleteDeadlineDates = {start: new Date(deadlineDates.start),
+
+            var start = deadlineDates.start;
+            if (start !== false) {
+                start = new Date(start);
+            }
+            var end = deadlineDates.end;
+            if (end !== false) {
+                end = new Date(end);
+            }
+
+            this.incompleteDeadlineDates = {start: start,
                                             userstart: deadlineDates.userstart,
-                                            end: new Date(deadlineDates.end),
+                                            end: end,
                                             userend: deadlineDates.userend};
             this.lastAttendDates = {start: new Date(lastAttendDates.start),
                                     userstart: lastAttendDates.userstart,
@@ -72,13 +82,14 @@ define([], function() {
         },
 
         isAllowedIncompleteDeadline: function(value) {
-            var date = new Date(value);
+            var date = new Date(value).getTime();
+            var st = this.incompleteDeadlineDates.start.getTime();
 
-            if (date < this.incompleteDeadlineDates.start) {
+            if ((this.incompleteDeadlineDates.start !== false) && (date < st)) {
                 return false;
             }
 
-            if (date > this.incompleteDeadlineDates.end) {
+            if ((this.incompleteDeadlineDates.end !== false) && (date > this.incompleteDeadlineDates.end.getTime())) {
                 return false;
             }
 
@@ -104,6 +115,20 @@ define([], function() {
                     end: this.lastAttendDates.userend};
         },
 
+        getIncompleteDeadlineStringName: function() {
+            if (this.incompleteDeadlineDates.start === false) {
+                return 'invalid_incomplete_date_end';
+            }
+            if (this.incompleteDeadlineDates.end === false) {
+                return 'invalid_incomplete_date_start';
+            }
+            if (this.incompleteDeadlineDates.start.getTime() === this.incompleteDeadlineDates.end.getTime()) {
+                return 'invalid_incomplete_date_single';
+            }
+
+            return 'invalid_incomplete_date_range';
+        },
+
         getStringIncompleteDeadline: function() {
             return {start: this.incompleteDeadlineDates.userstart,
                     end: this.incompleteDeadlineDates.userend};
diff --git a/amd/src/row_control.js b/amd/src/row_control.js
index 465212e..ee6913c 100755
--- a/amd/src/row_control.js
+++ b/amd/src/row_control.js
@@ -157,6 +157,9 @@ define(['jquery', 'gradeexport_ilp_push/page_info', 'core/ajax', 'core/notificat
                     errorCode = 'invalid_incomplete_date';
                 }
 
+                if (errorCode != '') {
+                    errorCode = pageInfo.getIncompleteDeadlineStringName();
+                }
                 RowController.updateFormWarning(row, '.incompletedateerror', errorCode, pageInfo.getStringIncompleteDeadline());
 
                 var incompleteSelect = row.find('.incompletegradeselect').eq(0);
diff --git a/classes/banner_grades.php b/classes/banner_grades.php
index 9efcb44..125d324 100644
--- a/classes/banner_grades.php
+++ b/classes/banner_grades.php
@@ -30,6 +30,7 @@
 
 use stdClass;
 use gradeexport_ilp_push\local\data\grade_mode;
+use gradeexport_ilp_push\local\sis_interface;
 
 /**
  * Deals with the interaction of banner grading.
@@ -219,30 +220,61 @@ public static function get_allowed_last_attend_dates($course, $format = false, $
         return $dates;
     }
 
+    /**
+     * Return the earliest and latest valid incomplete dates for the provided course.
+     *
+     * @param object $course The course object to reference.
+     * @param string $format The strftime format string to use.
+     * @param int $tz The timezone number to use.
+     * @return object The return object with keys of 'start' and 'end' timestamps.
+     *                Start set to 'false' will indicate before end (inclusive)
+     *                End set to 'false' will indicate after start (inclusive)
+     */
     public static function get_allowed_last_incomplete_deadline_dates($course, $format = false, $tz = 99) {
-        $dates = new stdClass();
+        $sis = sis_interface\factory::instance();
 
-        if (empty($course->enddate)) {
-            // We just have to guess. TODO better.
-            $courseend = $course->startdate + (3600 * 24 * 7 * 16);
-        } else {
-            $courseend = $course->enddate;
+        // First see if there are SIS dates.
+        $dates = $sis->get_allowed_last_incomplete_deadline_dates($course);
+
+        // If that didn't return anything, then get settings date.
+        if ($dates === false) {
+            $dates = new stdClass();
+
+            // Temp placeholder for 4/27/2020.
+            $dates->start = 1587988800;
+            $dates->end = 1587988800;
         }
 
-        // The day after the end of the course is the first allowed date (I think TODO).
-        $courseend += 3600 * 24;
+        // If we still don't have dates, we are going to make them up.
+        if ($dates === false) {
+            $dates = new stdClass();
+
+            if (empty($course->enddate)) {
+                // We just have to guess. TODO better.
+                $courseend = $course->startdate + (3600 * 24 * 7 * 16);
+            } else {
+                $courseend = $course->enddate;
+            }
+
+            // The day after the end of the course is the first allowed date (I think TODO).
+            $courseend += 3600 * 24;
 
-        $dates->start = $courseend;
+            $dates->start = $courseend;
 
-        $dates->end = $courseend + (3600 * 24 * 380);
+            $dates->end = $courseend + (3600 * 24 * 380);
+        }
 
         if (!$format) {
             return $dates;
         }
 
         // Convert to a format.
-        $dates->start = date_format_string($dates->start, $format, $tz);
-        $dates->end = date_format_string($dates->end, $format, $tz);
+        if ($dates->start !== false) {
+            $dates->start = date_format_string($dates->start, $format, $tz);
+        }
+        if ($dates->end !== false) {
+            $dates->end = date_format_string($dates->end, $format, $tz);
+        }
 
         return $dates;
     }
diff --git a/classes/local/sis_interface/base.php b/classes/local/sis_interface/base.php
index fd8cb51..4b4b87f 100644
--- a/classes/local/sis_interface/base.php
+++ b/classes/local/sis_interface/base.php
@@ -117,6 +117,20 @@ public function teacher_allowed_to_grade_course($user, $course) {
         return true;
     }
 
+    /**
+     * A function that allows the SIS to override the allowed incomplete dates for a course.
+     *
+     * Override to implement.
+     *
+     * @param object $course The course object to reference.
+     * @return object The return object with keys of 'start' and 'end' timestamps.
+     *                Start set to 'false' will indicate before end (inclusive)
+     *                End set to 'false' will indicate after start (inclusive)
+     */
+    public function get_allowed_last_incomplete_deadline_dates($course) {
+        return false;
+    }
+
 }
 
 
diff --git a/classes/rule_validator.php b/classes/rule_validator.php
index ee14e07..7c1fdb8 100644
--- a/classes/rule_validator.php
+++ b/classes/rule_validator.php
@@ -91,13 +91,14 @@ public static function validate_row(saved_grade $grade, grade_exporter $exporter
             if (is_null($grade->incompletedeadline)) {
                 // TODO - this might not be required...
                 $results['errors']['incompletedeadline'] = get_string('invalid_incomplete_date_missing', 'gradeexport_ilp_push');
-            } else if ($grade->incompletedeadline < $incompletedeadline->start) {
+            } else if (($incompletedeadline->start !== false) && ($grade->incompletedeadline < $incompletedeadline->start)) {
                 // If present, the incomplete date must be within a certain timeline (settings dependent).
                 // TODO better date ranges and error messages...
                 $results['errors']['incompletedeadline'] = get_string('invalid_incomplete_date_early', 'gradeexport_ilp_push');
-            } else if ($grade->incompletedeadline > $incompletedeadline->end) {
+            } else if (($incompletedeadline->end !== false) && ($grade->incompletedeadline > $incompletedeadline->end)) {
                 $results['errors']['incompletedeadline'] = get_string('invalid_incomplete_date_late', 'gradeexport_ilp_push');
             }
+
         }
 
         return $results;
diff --git a/classes/settings.php b/classes/settings.php
index 9d5d5c9..de67af4 100644
--- a/classes/settings.php
+++ b/classes/settings.php
@@ -41,6 +41,10 @@ class settings {
 
     protected $settings = null;
 
+    protected $termid = null;
+
+    protected $termsettings = null;
+
     /**
      * A static factory for the settings object.
      *
@@ -54,6 +58,10 @@ public static function get_settings() {
         return static::$settingobj;
     }
 
+    protected function set_term_id($termid) {
+
+    }
+
     protected function __construct() {
         $this->settings = get_config('gradeexport_ilp_push');
     }
diff --git a/lang/en/gradeexport_ilp_push.php b/lang/en/gradeexport_ilp_push.php
index 5175839..7e8c717 100644
--- a/lang/en/gradeexport_ilp_push.php
+++ b/lang/en/gradeexport_ilp_push.php
@@ -100,6 +100,10 @@
 
 $string['invalid_incomplete_grade'] = 'Default incomplete grade must be set to "{$a}".';
 $string['invalid_incomplete_date'] = 'Incomplete deadline must be between {$a->start} and {$a->end}. Please use MM/DD/YYYY or YYYY-MM-DD format.';
+$string['invalid_incomplete_date_range'] = 'Incomplete deadline must be between {$a->start} and {$a->end}. Please use MM/DD/YYYY or YYYY-MM-DD format.';
+$string['invalid_incomplete_date_start'] = 'Incomplete deadline must be on or after {$a->start}. Please use MM/DD/YYYY or YYYY-MM-DD format.';
+$string['invalid_incomplete_date_end'] = 'Incomplete deadline must be on or before {$a->end}. Please use MM/DD/YYYY or YYYY-MM-DD format.';
+$string['invalid_incomplete_date_single'] = 'Incomplete deadline must be on {$a->start}. Please use MM/DD/YYYY or YYYY-MM-DD format.';
 $string['invalid_datelastattended'] = 'Date last attended must be between {$a->start} and {$a->end}. Please use MM/DD/YYYY or YYYY-MM-DD format.';
 
 $string['grader_no_id'] = 'The current user has no SIS ID, and so cannot export grades to Banner.';