DateTime

SQLite does not have a storage class set aside for storing dates and/or times. Instead, the built-in Date And Time Functions of SQLite are capable of storing dates and times as INTEGER, TEXT or REAL values:

INTEGER as Unix Time, the number of seconds since 1970-01-01 00:00:00 UTC. 
TEXT as ISO8601 strings (“YYYY-MM-DD HH:MM:SS.SSS”).
REAL as Julian day numbers, the number of days since noon in Greenwich on November 24, 4714 B.C. according to the proleptic Gregorian calendar.

Integer is best if you will want to quickly search based on datetime values, etc.

Adding a column used for DateTime to a table

CREATE TABLE IF NOT EXISTS tbl1(id int primary key, CreatedDateTime INTEGER);

Adding a DateTime value to a column being used for DateTime

    db1cursor.execute("""INSERT INTO my_table(
                        CreatedDateTime,
                        CameraId
                    ) VALUES (
                        datetime('now'),    #This gives UTC DateTime
                        1
                    )""");

# datetime('now')        <<<Use for UTC
# datetime('now','localtime');        <<<Use for local time