Date formatting in SQL SERVER, using 2 functions

Date formatting in SQL SERVER, and instructions for using GETDATE() and CONVERT() functions.

Date formatting in SQL SERVER

• 1. date and datetime Type difference
• 2. GETDATE () function, return the current date and time (datetime type)
• 3. CONVERT () function, format the date

1. The difference between date and datetime types
Date is the new data type introduced in SQL Server 2008. It represents a date, does not contain a time part, and can represent a date range from January 1, 1999 to December 31, 9999. Only 3 bytes of storage are required.

dateTime date and time part, can represent the date range from 00:00:00.000 on January 1, 1753 to 23:59:59.997 on December 31, 9999, accurate to 3.33 milliseconds, it requires 8 bytes of storage space.

GETDATE () function

return the current date and time (datetime type)
SELECT GETDATE();
return
2017-03-16 09:10:08.947
For example, create a form M

CREATE TABLE [dbo].[M](
    [id] [int] NULL,
    [date] [date] NULL,
    [time] [datetime] NULL
) ON [PRIMARY]

You can insert data using the GETDATE() function

INSERT INTO M(id, date, time) VALUES (1, CONVERT(VARCHAR, GETDATE(), 110), GETDATE());

3. CONVERT () function, format the date
The CONVERT() function is a generic function that converts dates to new data types, and can also display date/time data in different formats.

grammar:

CONVERT(data_type(length),date,style)

• Data_type(length) specifies the target data type (with optional length). Date refers to the value that needs to be converted. Style Specifies the date/time output format.
• Style value that can be used: current time January 3, 2017 09:09:10:037

Style ID	SQL	Corresponding format
1	SELECT CONVERT(varchar(100), GETDATE(), 1);	01/03/17
2	SELECT CONVERT(varchar(100), GETDATE(), 2);	17.01.03
3	SELECT CONVERT(varchar(100), GETDATE(), 3);	03/01/17
4	SELECT CONVERT(varchar(100), GETDATE(), 4);	03.01.17
5	SELECT CONVERT(varchar(100), GETDATE(), 5);	03-01-17
6	SELECT CONVERT(varchar(100), GETDATE(), 6);	03 01 17
7	SELECT CONVERT(varchar(100), GETDATE(), 7);	01 03, 17
8	SELECT CONVERT(varchar(100), GETDATE(), 8);	09:09:10
9	SELECT CONVERT(varchar(100), GETDATE(), 9);	01 3 2017 9:09:10:037AM
10	SELECT CONVERT(varchar(100), GETDATE(), 10);	01-03-17
11	SELECT CONVERT(varchar(100), GETDATE(), 11);	17/01/03
12	SELECT CONVERT(varchar(100), GETDATE(), 12);	170103
13	SELECT CONVERT(varchar(100), GETDATE(), 13);	03 01 2017 09:09:10:037
14	SELECT CONVERT(varchar(100), GETDATE(), 14);	09:09:10:037
20	SELECT CONVERT(varchar(100), GETDATE(), 20);	2017-01-03 09:09:10
21	SELECT CONVERT(varchar(100), GETDATE(), 21);	2017-01-03 09:09:10.037
22	SELECT CONVERT(varchar(100), GETDATE(), 22);	01/03/17 9:09:10 AM
23	SELECT CONVERT(varchar(100), GETDATE(), 23);	2017-01-03
24	SELECT CONVERT(varchar(100), GETDATE(), 24);	09:09:10
25	SELECT CONVERT(varchar(100), GETDATE(), 25);	2017-01-03 09:09:10.037
100	SELECT CONVERT(varchar(100), GETDATE(), 100);	01 3 2017 9:09AM
101	SELECT CONVERT(varchar(100), GETDATE(), 101);	01/03/2017
102	SELECT CONVERT(varchar(100), GETDATE(), 102);	2017.01.03
103	SELECT CONVERT(varchar(100), GETDATE(), 103);	03/01/2017
104	SELECT CONVERT(varchar(100), GETDATE(), 104);	03.01.2017
105	SELECT CONVERT(varchar(100), GETDATE(), 105);	03-01-2017
106	SELECT CONVERT(varchar(100), GETDATE(), 106);	03 01 2017
107	SELECT CONVERT(varchar(100), GETDATE(), 107);	01 03, 2017
108	SELECT CONVERT(varchar(100), GETDATE(), 108);	09:09:10
109	SELECT CONVERT(varchar(100), GETDATE(), 109);	01 3 2017 9:09:10:037AM
110	SELECT CONVERT(varchar(100), GETDATE(), 110);	01-03-2017
111	SELECT CONVERT(varchar(100), GETDATE(), 111);	2017/01/03
112	SELECT CONVERT(varchar(100), GETDATE(), 112);	20170103
113	SELECT CONVERT(varchar(100), GETDATE(), 113);	03 01 2017 09:09:10:037
114	SELECT CONVERT(varchar(100), GETDATE(), 114);	09:09:10:037
120	SELECT CONVERT(varchar(100), GETDATE(), 120);	2017-01-03 09:09:10
121	SELECT CONVERT(varchar(100), GETDATE(), 121);	2017-01-03 09:09:10.037
126	SELECT CONVERT(varchar(100), GETDATE(), 126);	2017-01-03T09:09:10.037
130	SELECT CONVERT(varchar(100), GETDATE(), 130);	5 ???? ?????? 1438 9:09:10:037AM
131	SELECT CONVERT(varchar(100), GETDATE(), 131);	5/04/1438 9:09:10:037AM

Date formatting in SQL SERVER, and instructions for using GETDATE() and CONVERT() functions.