how to remove time from datetime

问题

The field DATE in the database has the following format:

2012-11-12 00:00:00

I would like to remove the time from the date and return the date like this:

11/12/2012

回答1:

First thing's first, if your dates are in varchar format change that, store dates as dates it will save you a lot of headaches and it is something that is best done sooner rather than later. The problem will only get worse.

Secondly, once you have a date DO NOT convert the date to a varchar! Keep it in date format and use formatting on the application side to get the required date format.

There are various methods to do this depending on your DBMS:

SQL-Server 2008 and later:

SELECT  CAST(CURRENT_TIMESTAMP AS DATE)

SQL-Server 2005 and Earlier

SELECT  DATEADD(DAY, DATEDIFF(DAY, 0, CURRENT_TIMESTAMP), 0)

SQLite

SELECT  DATE(NOW())

Oracle

SELECT  TRUNC(CURRENT_TIMESTAMP)

Postgresql

SELECT  CURRENT_TIMESTAMP::DATE

If you need to use culture specific formatting in your report you can either explicitly state the format of the receiving text box (e.g. dd/MM/yyyy), or you can set the language so that it shows the relevant date format for that language.

Either way this is much better handled outside of SQL as converting to varchar within SQL will impact any sorting you may do in your report.

If you cannot/will not change the datatype to DATETIME, then still convert it to a date within SQL (e.g. CONVERT(DATETIME, yourField)) before sending to report services and handle it as described above.

回答2:

just use, (in TSQL)

SELECT convert(varchar, columnName, 101)

in MySQL

SELECT DATE_FORMAT(columnName, '%m/%d/%Y')

回答3:

I found this method to be quite useful. However it will convert your date/time format to just date but never the less it does the job for what I need it for. (I just needed to display the date on a report, the time was irrelevant).

CAST(start_date AS DATE)

UPDATE

(Bear in mind I'm a trainee ;))

I figured an easier way to do this IF YOU'RE USING SSRS.

It's easier to actually change the textbox properties where the field is located in the report. Right click field>Number>Date and select the appropriate format!

回答4:

Personally, I'd return the full, native datetime value and format this in the client code.

That way, you can use the user's locale setting to give the correct meaning to that user.

"11/12" is ambiguous. Is it:

12th November
11th December

回答5:

SELECT DATE('2012-11-12 00:00:00');

returns

2012-11-12

回答6:

For more info refer this: SQL Server Date Formats

[MM/DD/YYYY]

SELECT CONVERT(VARCHAR(10), cast(dt_col as date), 101) from tbl

[DD/MM/YYYY]

SELECT CONVERT(VARCHAR(10), cast(dt_col as date), 103) from tbl

Live Demo

回答7:

In mysql at least, you can use DATE(theDate).

回答8:

You may try the following:

SELECT CONVERT(VARCHAR(10),yourdate,101);

or this:

select cast(floor(cast(urdate as float)) as datetime);

回答9:

Use this SQL:

SELECT DATE_FORMAT(date_column_here,'%d/%m/%Y') FROM table_name;

回答10:

TSQL

SELECT CONVERT(DATE, GETDATE())         // 2019-09-19
SELECT CAST(GETDATE() AS DATE)          // 2019-09-19
SELECT CONVERT(VARCHAR, GETDATE(), 23)  // 2019-09-19

来源：https://stackoverflow.com/questions/14279849/how-to-remove-time-from-datetime

标签

sql

date

reporting-services