## DATEDIFF(t,s)

DATEDIFF(t,s) is a date function that calculates the number of days between a start and end date.

Values t and s: When used in a function, the expressions t and s (date_or_timestamp_expression) must both supply a date, a time stamp, or an alphanumeric value that matches the current date or time stamp format.

| Result of the DATEDIFF(t,s) Function
Positive difference between t and s | Numeric value (number of days)
t or s are timestamp values | Only the dates in the timestamp value are used to calculate DATEDIFF(t,s).
t or s is a NULL value | NULL value

SELECT arrival, departure, DATEDIFF(departure,arrival) difference, rno
FROM reservation
WHERE rno = 130

ARRIVAL | DEPARTURE | DIFFERENCE | RNO
2005-02-01 | 2005-02-03 | 2 | 130