How to calculate the hour difference between two dates?

hi all,
how to calculate the hour difference between two dates?
eg i trying this...
((TO_DATE(TO_CHAR(GRNi.reference_date_4,'hh24:mi'),'hh24:mi') -
TO_DATE(TO_CHAR(NVL(GRNi.reference_date_3,SYSDATE),'hh24:mi'),'hh24:mi'))*24)*60 Act_Hr
Reg.
AAK

Hi
To break the diff between 2 dates into days, hours, minutes, sec -- you can use the following:
select to_char( created, 'dd-mon-yyyy hh24:mi:ss' ),
trunc( sysdate-created ) "Dy",
trunc( mod( (sysdate-created)*24, 24 ) ) "Hr",
trunc( mod( (sysdate-created)*24*60, 60 ) ) "Mi",
trunc( mod( (sysdate-created)*24*60*60, 60 ) ) "Sec",
to_char( sysdate, 'dd-mon-yyyy hh24:mi:ss' ),
sysdate-created "Tdy",
(sysdate-created)*24 "Thr",
(sysdate-created)*24*60 "Tmi",
(sysdate-created)*24*60*60 "Tsec"
from all_users
where rownum < 50
HTH
RangaReddy

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(sysdate-created)*24*60 "Tmi",
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from all_users
where rownum < 50
HTH
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Hi
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date_diff
public static long date_diff(java.lang.String format,
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java.lang.String toDate,
java.lang.String locStr,
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Method to get the difference between two dates in the given locale. The dates need to be in "yyyy-MM-dd" format. This function supports only Gregorian calendar.
Parameters:
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Calculate the difference between two dates

I would like to calculate the difference between two dates in PL/SQL and return the result as a number of days expressed as an integer value.

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p_date_1   VARCHAR2,
p_date_2   VARCHAR2
RETURN NUMBER
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v_sql_err      VARCHAR2 (4000);
BEGIN
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CEPTION
WHEN OTHERS
THEN
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SQLCODE;
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3
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