Sql Server Series: date and time functions (turn) Sql Server Series: date and time functions

Sql Server Series: date and time functions

 

1. Get the current system date function GETDATE ()

　　GETDATE () function returns the current date and time database systems, the return type is datetime.

SELECT GETDATE()

2. Return function GETUTCDATE UTC date ()

　　UTCDATE () function returns the current (UTC) date value UTC.

SELECT GETUTCDATE()

3. Obtain a function of the number of days DAY

　　DAY () function returns the specified date is the first day of the month, a range from 1 to 31. DAY with DATEPART (day, date) returns the same value.

　　grammar:

DAY ( date )

　　Example:

SELECT DAY(GETDATE())

SELECT DAY('2014-11-30')

4. Get function MONTH month

　　MONTH () function returns the integer value specified date in the month. MONTH Returns the value DATEPART (month, date) returned the same value.

　　grammar:

MONTH ( date )

　　Example:

SELECT MONTH(GETDATE())

SELECT MONTH('2014-11-30')

The function of acquiring the year YEAR

　　YEAR () returns an integer that represents the specified  date of the year. YEAR and DATEPART (year, date) returns the same value.

　　grammar:

YEAR ( date )

　　Example:

SELECT YEAR(GETDATE())

6. The acquisition date specified string value function portion DATENAME

　　Returns the specified  designated date of  the string of datepart

　　grammar:

DATENAME ( datepart , date )

　　datepart possible values: year, quarter, month, day, dayofyear, week, weekday and so on.

　　Example:

SELECT DATENAME(YEAR, GETDATE())
SELECT DATENAME(MONTH, GETDATE())
SELECT DATENAME(WEEK, GETDATE())
SELECT DATENAME(WEEKDAY, GETDATE())

7. Get function DATEPART date specified integer value portion

　　Returns a specified  specified date of  integer datepart of.

　　grammar:

DATEPART ( datepart , date )

　　datepart possible values: year, quarter, month, day, dayofyear, week, weekday and so on.

　　Example:

SELECT DATEPART(YEAR, GETDATE())
SELECT DATEPART(MONTH, GETDATE())
SELECT DATEPART(WEEK, GETDATE())
SELECT DATEPART(WEEKDAY, GETDATE())

8. Calculate the date and time function DATEADD

　　After the specified time interval number (signed integer) of the specified date specified datepart adding the return date. The number can be negative.

　　grammar:

DATEADD (datepart , number , date )

　　datepart possible values: year, quarter, month, day, dayofyear, week, weekday, hour, minute, second and so on.

　　Example:

SELECT DATEADD(YEAR, 1, GETDATE())

1. Get the current system date function GETDATE ()

　　GETDATE () function returns the current date and time database systems, the return type is datetime.

SELECT GETDATE()

2. Return function GETUTCDATE UTC date ()

　　UTCDATE () function returns the current (UTC) date value UTC.

SELECT GETUTCDATE()

3. Obtain a function of the number of days DAY

　　DAY () function returns the specified date is the first day of the month, a range from 1 to 31. DAY with DATEPART (day, date) returns the same value.

　　grammar:

DAY ( date )

　　Example:

SELECT DAY(GETDATE())

SELECT DAY('2014-11-30')

4. Get function MONTH month

　　MONTH () function returns the integer value specified date in the month. MONTH Returns the value DATEPART (month, date) returned the same value.

　　grammar:

MONTH ( date )

　　Example:

SELECT MONTH(GETDATE())

SELECT MONTH('2014-11-30')

The function of acquiring the year YEAR

　　YEAR () returns an integer that represents the specified  date of the year. YEAR and DATEPART (year, date) returns the same value.

　　grammar:

YEAR ( date )

　　Example:

SELECT YEAR(GETDATE())

6. The acquisition date specified string value function portion DATENAME

　　Returns the specified  designated date of  the string of datepart

　　grammar:

DATENAME ( datepart , date )

　　datepart possible values: year, quarter, month, day, dayofyear, week, weekday and so on.

　　Example:

SELECT DATENAME(YEAR, GETDATE())
SELECT DATENAME(MONTH, GETDATE())
SELECT DATENAME(WEEK, GETDATE())
SELECT DATENAME(WEEKDAY, GETDATE())

7. Get function DATEPART date specified integer value portion

　　Returns a specified  specified date of  integer datepart of.

　　grammar:

DATEPART ( datepart , date )

　　datepart possible values: year, quarter, month, day, dayofyear, week, weekday and so on.

　　Example:

SELECT DATEPART(YEAR, GETDATE())
SELECT DATEPART(MONTH, GETDATE())
SELECT DATEPART(WEEK, GETDATE())
SELECT DATEPART(WEEKDAY, GETDATE())

8. Calculate the date and time function DATEADD

　　After the specified time interval number (signed integer) of the specified date specified datepart adding the return date. The number can be negative.

　　grammar:

DATEADD (datepart , number , date )

　　datepart possible values: year, quarter, month, day, dayofyear, week, weekday, hour, minute, second and so on.

　　Example:

SELECT DATEADD(YEAR, 1, GETDATE())