Finished! The exception handling is not great, but unless you writes it wrong on purpose, it should be okay.

egon.py

@@ -18,7 +18,7 @@ from pysqlite2 import dbapi2 as sqlite
 from qrc_resources import *
 
 
-__version__ = "0.0.2"
+__version__ = "0.9.0"
 
 
 main = None
@@ -121,7 +121,6 @@ class MainWindow(QMainWindow):
         self.connect(self.reading.readingDoneButton, SIGNAL("pressed()"), self.doneReading)
         self.connect(self.schedule.addScheduleButton, SIGNAL("pressed()"), self.addLesson)
         self.connect(self.schedule.deleteScheduleButton, SIGNAL("pressed()"), self.deleteLesson)
-        self.connect(self.calendar, SIGNAL("selectionChanged()"), self.changeDay)
 
         # The toolbars
         fileToolbar = self.addToolBar("File")
@@ -144,6 +143,16 @@ class MainWindow(QMainWindow):
     
     # Semester
 
+    ## Open the New dialog	
+    def fileNew(self):
+        self.nsdlg = NewSemesterDlg()
+        self.nsdlg.show()
+
+    ## Open the Open dialog
+    def fileOpen(self):
+        self.osdlg = OpenSemesterDlg()
+        self.osdlg.show()	
+        
     ## Return the latest semester
     def getLatestSemester(self, semesters):
         if len(semesters) == 0:
@@ -335,16 +344,6 @@ class MainWindow(QMainWindow):
         <p>Developer: Tiril Anette Langfeldt Rødland, tirilane@pvv.ntnu.no
         """ % (self.title, __version__, platform.python_version(), QT_VERSION_STR, PYQT_VERSION_STR, platform.system()))
     
-    ## Open the New dialog	
-    def fileNew(self):
-        self.nsdlg = NewSemesterDlg()
-        self.nsdlg.show()
-
-    ## Open the Open dialog
-    def fileOpen(self):
-        self.osdlg = OpenSemesterDlg()
-        self.osdlg.show()	
-        
     ## Updates the File menu
     def updateFileMenu(self):
         self.fileMenu.clear()
@@ -721,6 +720,13 @@ class AssignmentDlg(QDialog):
         description = assignmentList[3]
         complete = assignmentList[4]
 
+        regex = QRegExp(r"[01-31].[01-12].[2000-2050] [00-23]:[00-60]")
+        validator = QRegExpValidator(regex, self)
+        valid = validator.validate(dateString, 16)	
+        if valid == QValidator.Invalid:
+            regexMessage = QErrorMessage()
+            regexMessage.showMessage(QString(self.trUtf8("The date is not in a correct format.")))
+
         if len(dateString) <= 11:
             dateList = dateString.split('.')		
             timeList = ['00', '00']
@@ -728,17 +734,42 @@ class AssignmentDlg(QDialog):
             dateTime = dateString.split()
             dateList = dateTime[0].split('.')
             timeList = dateTime[1].split(':')
+        print dateList, timeList
 
+        if dateList[1] > '13':
+            dateMessage = QErrorMessage()
+            dateMessage.showMessage(QString(self.trUtf8("The month is not valid. Please enter a valid date.")))	
+            print dateList[1]
+        elif dateList[0] > '31':
+            dateMessage = QErrorMessage()
+            dateMessage.showMessage(QString(self.trUtf8("The day is not valid. Please enter a valid date.")))	
+            print dateList[0]
+        elif timeList[0] > '23':
+            dateMessage = QErrorMessage()
+            dateMessage.showMessage(QString(self.trUtf8("The hour is not valid. Please enter a valid time.")))
+            print timeList[0]
+        elif timeList[1] > '59':
+            dateMessage = QErrorMessage()
+            dateMessage.showMessage(QString(self.trUtf8("The minutes are not valid. Please enter a valid time.")))
+            print timeList[1]
+        else: 
+            try:
                 date = QDate(string.atoi(dateList[2]), string.atoi(dateList[1]), string.atoi(dateList[0]))
                 time = QTime(string.atoi(timeList[0]), string.atoi(timeList[1]))
                 datetime = QDateTime(date, time)
+            except ValueError, e:
+                valueMessage = QErrorMessage()
+                valueMessage.showMessage(QString(self.trUtf8("The date is not valid. Please enter a date on the DD.MM.YYYY HH:MM form.")))	    
 
             course = getCourseFromDB(getCourseCode(courseFull))
 
+            try:
                 global semester
                 addNewAssignmentToDB(semester, datetime, course, number, description, complete)
-
                 assignment = AssignmentModel(datetime, course, number, description, complete)
+            except UnboundLocalError, e:
+                pass
+
             table = getMain().assignment.assignmentTable
             row = table.rowCount()
             table.insertRow(row)