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TO_CHAR(…, ‘D’)

How do I get than MONDAY=1, TUESDAY=2, WEDNESDAY=3 … ?

With to_char()

alter session set nls_territory=germany;
select to_char(sysdate,’DAY D’) from dual;

With decode()

select decode(to_char(sysdate, ‘FMDAY’, ‘NLS_DATE_LANGUAGE=american’),’MONDAY’, ‘1’, ‘TUESDAY’, ‘2’, ‘…’)) from dual;

With mod()
As a reference, I take monday Jan 1st, 1000.
select mod(trunc(sysdate)-date ‘1000-01-01’,7)+1 from dual;

How do I trunc date to current monday?
trunc(date, ‘D’) or here is with my solution with 1000-01-01:
select trunc((sysdate-date ‘1000-01-01’)/7)*7+date ‘1000-01-01′ from dual;

thanks to jan-marcel idea, I found that one
trunc(date,’IW’) for current monday and date-trunc(date,’IW’)+1 for day number

By Laurent Schneider

Oracle Certified Master

8 replies on “TO_CHAR(…, ‘D’)”

So you are suggesting I apply the setting ERROR_ON_OVERLAP_TIME in the session to avoid the ambiguity of daylight saving, like they are having in the United Kingdom’s GMT at the moment?

[…] I discovered a neat solution to this problem in Laurent Schneider’s blog here. […]

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