Any function for the first day of the month?

LAST_DAY returns the date of the last day of the month. Any function for the first day of the month? Thanks!

trunc(my_date,'MM')

Have a browse of the SQL Reference manual.

what is last day + 1??? LOL

Code:

---

SQL> select sysdate from dual;

SYSDATE
=========
02-MAY-03

1 row selected.

SQL> select last_day(sysdate)+1 from dual;

LAST_DAY(
=========
01-JUN-03

1 row selected.

SQL> select last_day(trunc(sysdate,'MM')-1)+1 from dual;

LAST_DAY(
=========
01-MAY-03

1 row selected.

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Thank you.