CREATE OR REPLACE FUNCTION Unix_To_Oracle_Date
(
p_unix_date IN NUMBER Range of >=
p_num_hr_gmt_diff IN PLS_INTEGER Range of to +
) RETURN DATE AS
/*
Function Name:Unix_To_Oracle_Date
Purpose:To calculate an Oracle date based on a Unix GMT date
in seconds since the epoch of Unix (January st )
The date returned will be based on the number of hours
the oracle database system clock is either ahead or behind
the Greenwich Mean Time line
If the parameters do not fall within the specified ranges
then the returned date will be NULL
Developer Name: Giovanni Jaramillo
Developer Email:G
Creation Date:Copyright ? December
Parameters: p_unix_date of NUMBER type (Range is > only)
p_num_hr_gmt_diff of PLS_INTEGER type (Range to +)
Input:NONE
Output: NONE
Returned value: DATE := Unix_To_Oracle_Date(p_Unix_Date);
*/
CONSTANTS
These CONSTANTS below are of POSITIVE type to indicate that they
CANNOT be less than
c_SECONDS_IN_DAY CONSTANT POSITIVE := ;
c_HOURS_IN_DAY CONSTANT POSITIVE := ;
c_UNIX_EPOCH_DATE_TIME_STRING CONSTANT VARCHAR() := // ::;
c_DATE_FORMAT CONSTANT VARCHAR() := MM/DD/YYYY HH:MI:SS;
VARIABLES
v_sql_code PLS_INTEGER;
v_sql_error_message VARCHAR();
The variables have to be of NUMBER type because a PLS_INTEGER divided by
another PLS_INTEGER can result in a fraction thus the result must be of
NUMBER type only
v_unix_seconds NUMBER;
v_gmt_time_gap NUMBER;
v_return_value DATE;
BEGIN
IF(NOT (p_num_hr_gmt_diff < (c_HOURS_IN_DAY)) AND
NOT (p_num_hr_gmt_diff > (c_HOURS_IN_DAY))) THEN
v_unix_seconds := (p_unix_date / c_SECONDS_IN_DAY);
v_gmt_time_gap := (p_num_hr_gmt_diff / c_HOURS_IN_DAY);
v_return_value := TO_DATE(c_UNIX_EPOCH_DATE_TIME_STRING c_DATE_FORMAT) +
v_unix_seconds + v_gmt_time_gap;
ELSE
v_return_value := NULL;
END IF;
RETURN(v_return_value);
EXCEPTION
WHEN OTHERS THEN
v_sql_code := SQLCODE;
v_sql_error_message := SQLERRM(v_sql_code);
DBMS_OUTPUTPUT_LINE(OTHER ERROR);
DBMS_OUTPUTPUT_LINE(v_sql_error_message);
END Unix_To_Oracle_Date;
