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1¡£Sysdate µ±Ç°ÈÕÆÚºÍʱ¼ä
SQL> Select sysdate from dual;
SYSDATE
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2¡£Last_day ±¾ÔÂ×îºóÒ»Ìì 
SQL> Select last_day(sysdate) from dual;
LAST_DAY(S
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date_value:=add_months(date_value,number_of_months)
SQL> Select add_months(sysdate,2) from dual;
ADD_MONTHS
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4¡£Months_between(f,s) ÈÕÆÚfºÍs¼äÏà²îÔÂÊý 
SQL> select months_between(sysdate,to_date('2005-11-12','yyyy-mm-dd'))from dual;
MONTHS_BETWEEN(SYSDATE,TO_DATE('2005-11-12','YYYY-MM-DD'))
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5¡£NEXT_DAY(d, day_of_week)
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SQL> SELECT next_day(to_date('20050620','YYYYMMDD'),1) from dual;
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date_value:=current_date 
SQL> column sessiontimezone for a15 
SQL> select sessiontimezone,current_date from dual; 
SESSIONTIMEZONE CURRENT_DA 
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SQL> alter session set time_zone='-11:00' 2  / 
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