timestamp column in sqlite return string in python

i create a table with SQLite Date Browse App ...

when i want retrieve datetime value from timestamp column , SQLite return unicod type ...

this is my insert code :

def Insert(self,mode,path,vname,stime,ftime):
        con = sqlite3.connect(PATH_DataBase)  # @UndefinedVariable
        con.execute('INSERT INTO SendList VALUES(?,?,?,?,?)',(mode,path,vname,stime,ftime))
        con.commit()
        con.close()

dt1 = datetime.datetime(2013,01,01,01,01,01,0)
dt2 = datetime.datetime(2015,01,01,01,01,01,0)
c = 0
    for f in os.listdir('/home/abbas/test/'):
        c += 1
        slist.Insert(common.MODE_Bluetooth_JAVA, '/home/abbas/test/'+f,'flower'+str(c) , dt1, dt2)

and now this is my table :

but when i want compare starttime with datetime.now() python give me error :

TypeError: can't compare datetime.datetime to unicode