Help adding a loop inside a loop

[Extra]

If I do time=scheduled_time.timestamp(), (like I did in the code below)
I get this error

Error:
   time=scheduled_time.timestamp(),
AttributeError: 'tuple' object has no attribute 'timestamp'

because the Scheduled_time is being taken from the SQLite database.

Is there a way to get around this error?
How do I convert those tuple objects to a datetime object (is that even possible)?

connection = sqlite3.connect(MainDatabase)
for row in connection.execute("SELECT DateTime FROM Reminders"):
    scheduled_time = row
    print("Scheduled Time: ",  scheduled_time)
connection.close()

def schedule_reminder(reminder):
    """Schedule a reminder"""
    scheduler.enterabs(
        time=scheduled_time.timestamp(),
        priority=1,  
        action=send_reminder,
        argument=(reminder, scheduled_time))