oracle timestamp to date with code examples

In Oracle, the TIMESTAMP data type is used to store date and time information. This data type includes information about the date, as well as the time of day, with a precision of up to 9 decimal places for the fractional seconds.

To convert a TIMESTAMP value to a DATE value, the TO_DATE function can be used. The TO_DATE function takes a string input and converts it to a date value using a specified format mask. The format mask for the TIMESTAMP data type is 'YYYY-MM-DD HH24:MI:SS.FF'.

Here's an example of how to convert a TIMESTAMP value to a DATE value in Oracle SQL:

SELECT TO_DATE(TO_CHAR(timestamp_column, 'YYYY-MM-DD HH24:MI:SS.FF'), 'YYYY-MM-DD HH24:MI:SS.FF')
FROM table_name;

Alternatively, you can use the TRUNC function to remove the time portion of a TIMESTAMP value, leaving only the date:

SELECT TRUNC(timestamp_column) FROM table_name;

In PL/SQL, the following code can be used to convert a TIMESTAMP value to a DATE value:

declare
  timestamp_value TIMESTAMP := SYSTIMESTAMP;
  date_value DATE;
begin
  date_value := TRUNC(timestamp_value);
  dbms_output.put_line(date_value);
end;

It is also possible to convert a TIMESTAMP value to a DATE value using the CAST function:

SELECT CAST(timestamp_column as DATE) FROM table_name;

In this way you can convert the timestamp to date in Oracle.

In addition to converting TIMESTAMP to DATE, Oracle also provides several other functions for working with date and time values.

• The SYSDATE function returns the current date and time on the system.
• The ADD_MONTHS function can be used to add or subtract a specified number of months from a date value.
• The LAST_DAY function returns the last day of the month for a given date.
• The NEXT_DAY function returns the date of the next specified day of the week after a given date.
• The MONTHS_BETWEEN function calculates the number of months between two date values.
• The ROUND and TRUNC functions can be used to round or truncate a date value to a specific unit of time (e.g. day, month, year).

Here are some examples of how these functions can be used:

-- Adding 3 months to a date value
SELECT ADD_MONTHS(date_column, 3) FROM table_name;

-- Finding the last day of the month for a given date
SELECT LAST_DAY(date_column) FROM table_name;

-- Finding the next Monday after a given date
SELECT NEXT_DAY(date_column, 'MONDAY') FROM table_name;

-- Calculating the number of months between two date values
SELECT MONTHS_BETWEEN(date1, date2) FROM table_name;

-- Rounding a date value to the nearest month
SELECT ROUND(date_column, 'MONTH') FROM table_name;

-- Truncating a date value to the nearest day
SELECT TRUNC(date_column, 'DAY') FROM table_name;

Oracle also provides support for various time zones. The SESSIONTIMEZONE and DBTIMEZONE functions can be used to retrieve the current time zone for the session or database, respectively. The NEW_TIME function can be used to convert a date value from one time zone to another.

-- Getting the current time zone for the session
SELECT SESSIONTIMEZONE FROM DUAL;

-- Getting the current time zone for the database
SELECT DBTIMEZONE FROM DUAL;

-- Converting a date value from one time zone to another
SELECT NEW_TIME(date_column, '-8:00', '+2:00') FROM table_name;

It is important to note that when working with date and time values in Oracle, it is important to be aware of the data type and format of the values you are working with, as well as any time zone considerations that may apply. The provided functions and examples should help you to manipulate and convert date and time values as needed in your Oracle database.

Popular questions

1. How can I convert a TIMESTAMP value to a DATE value in Oracle SQL?
   Answer: You can use the TO_DATE function with a format mask of 'YYYY-MM-DD HH24:MI:SS.FF' to convert a TIMESTAMP value to a DATE value in Oracle SQL. Example:

SELECT TO_DATE(TO_CHAR(timestamp_column, 'YYYY-MM-DD HH24:MI:SS.FF'), 'YYYY-MM-DD HH24:MI:SS.FF')
FROM table_name;

2. Can I use the TRUNC function to remove the time portion of a TIMESTAMP value and leave only the date?
   Answer: Yes, you can use the TRUNC function to remove the time portion of a TIMESTAMP value and leave only the date. Example:

SELECT TRUNC(timestamp_column) FROM table_name;

3. How can I convert a TIMESTAMP value to a DATE value in PL/SQL?
   Answer: You can use the TRUNC function or CAST function to convert a TIMESTAMP value to a DATE value in PL/SQL. Example:

declare
  timestamp_value TIMESTAMP := SYSTIMESTAMP;
  date_value DATE;
begin
  date_value := TRUNC(timestamp_value);
  dbms_output.put_line(date_value);
end;

declare
  timestamp_value TIMESTAMP := SYSTIMESTAMP;
  date_value DATE;
begin
  date_value := CAST(timestamp_value as DATE);
  dbms_output.put_line(date_value);
end;

4. Can I use the ADD_MONTHS function to add or subtract a specified number of months from a date value?
   Answer: Yes, you can use the ADD_MONTHS function to add or subtract a specified number of months from a date value. Example:

SELECT ADD_MONTHS(date_column, 3) FROM table_name;

5. How can I convert a date value from one time zone to another in Oracle?
   Answer: You can use the NEW_TIME function to convert a date value from one time zone to another in Oracle. Example:

SELECT NEW_TIME(date_column, '-8:00', '+2:00') FROM table_name;

It is important to note that the examples provided are just an illustration and you may need to adjust the syntax to suit your specific needs and context.

Tag

Conversion.