Found that the createLog context menu passes in the row context to the method, but with basic info e.g.: "day: 2, dayOfWeek:'tuesday'" etc.

Now use this "day:2" to add to the selected timelog date interval (the date of the monday of the selected week). To now calculate the period. This is then used to update the log date picker when manually creating a log.

#82

DataCenter_Windows/WindowsDataCenter/WindowsDataCenter/www/spa.js

@@ -156,7 +156,7 @@
         var args = [
             {
                 key: "groupId",
-                value: data
+                value: datacreateContextMenu
             }
         ];
         var url = self.helpers.createRequestUrl("users", args, false, false);
@@ -396,17 +396,18 @@
         self.assignUpdateHandler();
     };
     function createlog(data, event) {
+        var logDateInitVal = moment(self.selectedTimeLogDate()).add((data.Day - 1), 'days').toISOString();
         self.manualLog({
             CalendarWeek:-1,
             Direction:-1,
-            EventTime: new Date().toISOString(),
+            EventTime: logDateInitVal,
             Id: -1,
             IdentifierId: -1,
             UserId: self.chosenTimeLogUserId,
             Year: 0
         });
         $('#manualLogDialog').modal("show");
-        self.initialiseManualLogDateTimePicker(self.selectedTimeLogDate());
+        self.initialiseManualLogDateTimePicker(logDateInitVal);
         self.assignUpdateHandler();
     };
     function deleteLog(data) {