SQL Server Date-time-to-string

OneSQL Server Date-time functions
Date and time functions in SQL Server
1. Current system date, time
SelectGetDate()

2.DateAddOn the basis of adding a period of time to the specified date, return the newDatetimeValue
Example: Add 2 days to the date
SelectDateAdd(Day,2,‘2004-10-15‘)--return: 2004-10-17 00:00:00.000

3.DateDiffReturns the number of date and time boundaries across two specified dates.
SelectDateDiff(Day,‘2004-09-01‘,‘2004-09-18‘)--Returns: 17

4.DatePartReturns an integer representing the specified date portion of the specified date.
SelectDATEPART(Month,‘2004-10-15‘)--Returns 10

5.DatenameReturns a string representing the specified date part of a specified date
SelectDatename(Weekday,‘2004-10-15‘)--return: Friday

6.Day(),Month(),Year()--You can compare it with datepart.

SelectCurrent date=Convert(varchar(10),GetDate(),120)
, the current time=Convert(varchar(8),GetDate(),114)

SelectDatename(DW,‘2004-10-15‘)

SelectHow many weeks this year=Datename(Week,‘2004-10-15‘)
, today is the day of the week=Datename(Weekday,‘2004-10-15‘)

Select CONVERT (varchar), GETDATE (), 0): 2006 10:57am
Select CONVERT (varchar), GETDATE (), 1): 05/16/06
Select CONVERT (varchar), GETDATE (), 2): 06.05.16
Select CONVERT (varchar), GETDATE (), 3): 16/05/06
Select CONVERT (varchar), GETDATE (), 4): 16.05.06
Select CONVERT (varchar), GETDATE (), 5): 16-05-06
Select CONVERT (varchar), GETDATE (), 6): 16 05 06
Select CONVERT (varchar), GETDATE (), 7): 05 16, 06
Select CONVERT (varchar), GETDATE (), 8): 10:57:46
Select CONVERT (varchar), GETDATE (), 9): 2006 10:57:46:827am
Select CONVERT (varchar), GETDATE (), 10): 05-16-06
Select CONVERT (varchar), GETDATE (), 11): 06/05/16
Select CONVERT (varchar), GETDATE (), 12): 060516
Select CONVERT (varchar), GETDATE (), 13): 16 05 2006 10:57:46:937
Select CONVERT (varchar), GETDATE (), 14): 10:57:46:967
Select CONVERT (varchar), GETDATE (), 20): 2006-05-16 10:57:47
Select CONVERT (varchar), GETDATE (), 21): 2006-05-16 10:57:47.157
Select CONVERT (varchar), GETDATE (): 05/16/06 10:57:47 AM
Select CONVERT (varchar), GETDATE (), 23): 2006-05-16
Select CONVERT (varchar), GETDATE (), 24): 10:57:47
Select CONVERT (varchar), GETDATE (), 25): 2006-05-16 10:57:47.250
Select CONVERT (varchar), GETDATE (), (+): 2006 10:57am
Select CONVERT (varchar), GETDATE (), 101): 05/16/2006
Select CONVERT (varchar), GETDATE (), 102): 2006.05.16
Select CONVERT (varchar), GETDATE (), 103): 16/05/2006
Select CONVERT (varchar), GETDATE (), 104): 16.05.2006
Select CONVERT (varchar), GETDATE (), 105): 16-05-2006
Select CONVERT (varchar), GETDATE (), 106): 16 05 2006
Select CONVERT (varchar), GETDATE (), 107): 05 16, 2006
Select CONVERT (varchar), GETDATE (), 108): 10:57:49
Select CONVERT (varchar), GETDATE (), 109): 2006 10:57:49:437am
Select CONVERT (varchar), GETDATE (), 110): 05-16-2006
Select CONVERT (varchar), GETDATE (), 111): 2006/05/16 
select CONVERT (varchar (+), GETDATE (), 112): 20060516 
select CONVERT (varchar), GETDATE (), 113): 2006 10:57:49:513 
select CONVERT ( varchar (+), GETDATE (), (): 10:57:49:547 
 
select CONVERT (varchar), GETDATE (), 121): 2006-05-16 10:57:49.700 
select CONVERT (varchar), GETDATE (), 126): 2006-05-16t10:57:49.827 
select CONVERT (varchar), GETDATE (), ():???? ?????? 1427 10:57:49:907am

 

Function	Parameters/Functions
GetDate ()	Returns the current date and time of the system
DateDiff (INTERVAL,DATE1,DATE2)	Returns the difference between Date2 and date1 two dates, as specified by interval date2-date1
DATEADD (Interval,number,date)	The date specified by interval, plus number
DatePart (Interval,date)	Returns the integer value that corresponds to the specified part of the date interval
Datename (Interval,date)	Returns the string name corresponding to the specified part of the date, interval

The setting values for the parameter interval are as follows:

tbody> TD bgcolor= "#ffffff" > return date, interval the integer value corresponding to the specified part

function	Parameters/Features
getdate ()	Returns the current date and time of the system
datediff (interval,date1,date2)
dateadd (interval,number,date)
datepart (interval,date)
datename (interval,date)

Value	Abbreviation (SQL Server)	Access and ASP	Description
Year	Yy	yyyy	Year 1753 ~ 9999
Quarter	Qq	Q	Season 1 ~ 4
Month	Mm	M	Month 1 ~ 12
Day of the Year	Dy	Y	The number of days in a year, the day of the year 1-366
Day	Dd	D	Day, 1-31
Weekday	Dw	W	The number of days in a week, the day of the week 1-7
Week	Wk	Ww	Week, week of the year 0 ~ 51
Hour	Hh	H	Time 0 ~ 23
Minute	Mi	N	Minutes 0 ~ 59
Second	Ss	S	seconds 0 ~ 59
millisecond	ms	-	MS 0 ~ 999