How to convert value to_date characters?

I want to change the time (hours) sysdate to '10', then save this new date in a date column that I wrote the following command
(TO_CHAR(SYSDATE,'DD-MON-RRRR')||' 10:'||TO_CHAR(SYSDATE,'MI:SS AM'))
This command deletes the actual hours of sysdate and change with the value "10". but the result of this command is a character value. and I want a date value into a date column. to do this, I have converted this command to_date as follows
TO_DATE(TO_CHAR(SYSDATE,'DD-MON-RRRR')||' 10:'||TO_CHAR(SYSDATE,'MI:SS AM'))
but it gives the following error

ORA-01830: date format picture ends before converting all of the input string

How to do this?

Gul says:
I want to change the time (hours) sysdate to '10', then save this new date in a date column that I wrote the following command

(TO_CHAR(SYSDATE,'DD-MON-RRRR')||' 10:'||TO_CHAR(SYSDATE,'MI:SS AM'))

This command deletes the actual hours of sysdate and change with the value "10". but the result of this command is a character value. and I want a date value into a date column. to do this, I have converted this command to_date as follows

TO_DATE(TO_CHAR(SYSDATE,'DD-MON-RRRR')||' 10:'||TO_CHAR(SYSDATE,'MI:SS AM'))

but it gives the following error

ORA-01830: date format picture ends before converting all of the input string

How to do this?

TO_DATE (TO_CHAR(SYSDATE,'DD-MON-YYYY') |) ' 10 :'|| TO_CHAR(SYSDATE,'MI:SS_AM'),' DD-MON-YYYY HH: MI: SS AM')

Tags: Database

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