Add Day to Timestamp

Question

How do I add days to a timestamp? If my timestamp is 01-JAN-2011 11-09-05 and I add 2 days, I want 03-JAN-2011 11-09-05.

Weigela

Answer 1

select '01-jan-2011 11-09-05' + interval '2' day

Borneo

+1. A more complete Oracle example: SELECT TO_TIMESTAMP('01-jan-2011 11-09-05','DD-Mon-YYYY HH24-MI-SS') + INTERVAL '2' DAY FROM dual; – Suet

Using interval seems better than using + because I noticed loss of timezone with the latter. – Cointreau

Answer 2

A completely Oracle-centric solution is to simply add 2 to the timestamp value as the default interval is days for Oracle dates/timestamps:

SELECT TO_TIMESTAMP('01-jan-2011 11-09-05','DD-Mon-YYYY HH24-MI-SS') + 2
  FROM dual;

Suet

a timestamp plus a numeric value yields a date. – Robichaux

you may lose the timezone by using +. – Cointreau

Answer 3

In a similar case, I used:

SELECT TO_TIMESTAMP('01-jan-2011 11-09-05','DD-Mon-YYYY HH24-MI-SS') + NUMTODSINTERVAL(2, 'DAY')

Because, othewise, the expression is converted to DATE and precission is lost. See: NUMTODSINTERVAL documentation

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