Sql — date functions

Date Function CAST

CAST is used similar to the CONVERT function, to change date types. For
dates you typically can use CAST to either change the data type of string to a date
data type or change a date to character data type.

Syntax: CAST(expression AS data_type)

Example of CAST(): Compare cast and convert and basic Cast to date and
datetime.

--1. Example: CAST() vs CONVERT:
SELECT GETDATE() AS ,  
   CAST(GETDATE() AS NVARCHAR(30)) AS ,  
   CONVERT(nvarchar(30), GETDATE(), 100) AS  ;  
GO 
 
--2. Example: Cast to data types DATE and DATETIME.
SELECT CAST('1 Jan 2021' AS DATE) AS , 
   CAST('20210101' AS DATE) AS ,
   CAST('1/1/2021' AS DATETIME) AS ,
   CAST('2021-01-01 12:00:55.520' AS DATETIME) AS ;
GO

Results:

Wrap Up

There are several ways to get Current Date and Time values in MSSQL with
numerous SQL functions. Hopefully,
this tutorial helped to identify the different options and highlighted differences between
them and will aid in identifying when to use each one.

Next Steps

Review the examples to get familiar with the different ways to get the current
date in SQL.
Learn more about SQL Dates and Times from these MSSQLTips.com Articles:
- Convert SQL Server DateTime Data Type to DateTimeOffset Data Type
- SQL Server Date and Time Functions with Examples
- Converting UTC to local time with SQL Server CLR
- SQL Server DateTime Best Practices
- Build a cheat sheet for SQL Server date and time formats
- DATEDIFF SQL Server Function
- Add and Subtract Dates using DATEADD in SQL Server
- Determine SQL Server Date and Time Parts with DATEPART and DATENAME
  Functions

Date and Time Conversions Using SQL Server

SQL Server function to convert integer date to datetime format

Determine SQL Server Date and Time Parts with DATEPART and DATENAME Functions

Add and Subtract Dates using DATEADD in SQL Server

Format SQL Server Dates with FORMAT Function

Handle conversion between time zones in SQL Server — part 1

Creating a date dimension or calendar table in SQL Server

SQL Server DateTime Best Practices

Create an Extended Date Dimension for a SQL Server Data Warehouse

Using T-SQL to find events that overlap (or don’t) in SQL Server

SQL Server Date and Time Functions with Examples

Simplify Date Period Calculations in SQL Server

Fill In Missing Dates for SQL Server Query Output

SQL Server FORMAT Function for Dates, Numbers and SQL Server Agent Dates

Update only Year, Month or Day in a SQL Server Date

SQL Convert Date to YYYYMMDD

How to Expand a Range of Dates into Rows using a SQL Server Numbers Table

DATEDIFF SQL Server Function

Using a calendar table in SQL Server — Part 1

SQL DATE Functions

TIME_FORMAT(time,format)

This function is used like the DATE_FORMAT() function, but the format string may contain format specifiers only for hours, minutes and seconds.

If the time value contains an hour part that is greater than 23, the %H and %k hour format specifiers produce a value larger than the usual range of 0 to 23. The other hour format specifiers produce the hour value modulo 12.

mysql> SELECT TIME_FORMAT('100:00:00', '%H %k %h %I %l');
+---------------------------------------------------------+
| TIME_FORMAT('100:00:00', '%H %k %h %I %l')              |
+---------------------------------------------------------+
| 100 100 04 04 4                                         |
+---------------------------------------------------------+
1 row in set (0.00 sec)

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CURTIME()

Returns the current time as a value in ‘HH:MM:SS’ or HHMMSS format, depending on whether the function is used in a string or in a numeric context. The value is expressed in the current time zone.

mysql> SELECT CURTIME();
+---------------------------------------------------------+
| CURTIME()                                               |
+---------------------------------------------------------+
| 23:50:26                                                |
+---------------------------------------------------------+
1 row in set (0.00 sec)

mysql> SELECT CURTIME() + 0;
+---------------------------------------------------------+
| CURTIME() + 0                                           |
+---------------------------------------------------------+
| 235026                                                  |
+---------------------------------------------------------+
1 row in set (0.00 sec)

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MySQL

There are a few ways to get the current date and time in MySQL.

Function	Returns
NOW()	Current date and time in session time zone in YYYY-MM-DD hh:mm:ss
SYSDATE()	Current date and time in session time zone in YYYY-MM-DD hh:mm:ss
CURRENT_DATE()	Synonym for CURDATE
CURDATE()	Current date in YYYY-MM-DD
CURRENT_TIMESTAMP()	Synonym for NOW
LOCALTIME()	Synonym for NOW
LOCALTIMESTAMP()	Synonym for NOW
UTC_DATE()	Current date and time in UTC time zone in YYYY-MM-DD
UTC_TIMESTAMP()	Current date and time in UTC time zone in YYYY-MM-DD hh:mi:ss

Where a function is a synonym for another, it means it just has another name. For example, calling CURRENT_TIMESTAMP is the same as calling NOW.

So, excluding those functions that are synonyms, there are only a few functions:

NOW
SYSDATE
CURDATE
UTC_DATE
UTC_TIMESTAMP

Let’s see an example of them.

I’ve included CURRENT_DATE as it’s commonly used.

The results are below (translated to rows to make it easier to compare):

Function	Result
NOW	2020-07-15 16:55:47
SYSDATE	2020-07-15 16:55:47
CURDATE	2020-07-15
CURRENT_DATE	2020-07-15
UTC_DATE	2020-07-15
UTC_TIMESTAMP	2020-07-15 06:55:47

You can see a few things here:

NOW and SYSDATE show the same value.
CURDATE and CURRENT_DATE are the same, as expected, as one is a synonym of the other.
UTC_DATE is the same as the other two functions as it just happens to be the same day in UTC time.
UTC_TIMESTAMP shows the current time in UTC, which is 10 hours behind my current time.

What’s the Difference Between NOW, SYSDATE and CURRENT_DATE in MySQL?

All three of these functions (NOW, SYSDATE, and CURRENT_DATE) seem like the same thing.

But they have their differences. How are they different?

CURRENT_DATE (and CURDATE) show just a date value, and don’t include time.

NOW and SYSDATE are very similar. The difference is when the time is calculated:

NOW returns the time at which the function or triggering statement began to execute
SYSDATE returns the time at which it actually ran

An example of this can be seen by using the SLEEP function to wait for a few seconds:

NOW()	SLEEP(5)	NOW()
2020-07-15 17:00:35	2020-07-15 17:00:35

Notice that both calls to NOW show the same result, because that was the time when the SELECT statement started.

We can do the same thing with the SYSDATE function

SYSDATE()	SLEEP(5)	SYSDATE()
2020-07-15 17:01:15	2020-07-15 17:01:20

Notice that both calls to SYSDATE show a different result, because it shows the time when the actual SYSDATE function was called.

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SQL Server

There are several ways to get the current date in SQL Server, and all of them use functions.

Function	Data Type	Returns
SYSDATETIME()	datetime2	Server date time to 7 fractional seconds
SYSDATETIMEOFFSET()	datetimeoffset	Server date time with time zone to 7 fractional seconds
SYSUTCDATETIME()	datetime2	Server date time in UTC to 7 fractional seconds
CURRENT_TIMESTAMP	datetime	Server date time to 3 fractional seconds
GETDATE()	datetime	Server date time to 3 fractional seconds
GETUTCDATE()	datetime	Server date time in UTC to 3 fractional seconds

These six functions all return the date and time to different amounts of fractional seconds or based on time zones. Notice that CURRENT_TIMESTAMP does not need any opening or closing brackets.

(You can read more about MySQL date data types and functions in this guide)

Let’s see an example of this.

The results are below (translated to rows to make it easier to compare):

Function	Result
SYSDATETIME()	2020-07-15 16:24:38.7750094
SYSDATETIMEOFFSET()	2020-07-15 16:24:38.7750094 +00:00
SYSUTCDATETIME()	2020-07-15 06:24:38.7750094
CURRENT_TIMESTAMP	2020-07-15 16:24:38.773
GETDATE()	2020-07-15 16:24:38.773
GETUTCDATE()	2020-07-15 06:24:38.773

You can see some differences here:

The first three functions show fractional seconds to 7 places.
The two UTC time functions show the current time in the UTC time zone. I ran these functions in Melbourne, Australia, which is UTC +10.

You can also see that CURRENT_TIMESTAMP and GETDATE() show the same values.

CURRENT_TIMESTAMP vs GETDATE

What’s the difference between CURRENT_TIMESTAMP and GETDATE() in SQL Server?

CURRENT_TIMESTAMP is an ANSI SQL compliant function, meaning it complies with the standards (and is likely to exist in other database vendors). GETDATE() is the T-SQL version of that function.

How to Get Just the Current Date in SQL Server

The functions above show the current date and time.

But what if you only want to get the current date, and not the time?

There are two ways you can do that: use CAST or use CONVERT.

I’ve written about this method in a recent post: How to Convert DATETIME to DATE in SQL Server.

Here’s an example:

Result:

date_cast	date_convert
2020-07-15	2020-07-15

Both methods return the same value.

Форматирование даты и времени с помощью PHP-функции date()

Параметр формата функции на самом деле представляет собой строку, которая может содержать несколько символов, что позволяет вам сгенерировать строку даты, содержащую различные компоненты даты и времени, такие как день недели, AM или PM и т. д. Вот некоторые из символов форматирования, связанные с датой, которые обычно используются в этой строке:

— обозначает день месяца; две цифры с ведущими нулями (01 или 31)
— обозначение дня недели в тексте в виде сокращения (с понедельника по воскресенье)
— обозначает месяц цифрами с ведущими нулями (01 или 12)
— обозначает месяц в тексте, сокращенно (с января по декабрь)
— обозначают год двумя цифрами (08 или 14)
— обозначает год четырьмя цифрами (2008 или 2014)

Части даты можно разделить, вставив другие символы, например дефисы (), точки (), слеши () или пробелы, чтобы добавить дополнительное визуальное форматирование.

Вы можете использовать PHP-функцию для автоматического обновления срока действия авторских прав на вашем веб-сайте, например:

Точно так же вы можете использовать следующие символы для форматирования строки времени:

— обозначает час в 12-часовом формате с ведущими нулями (от 01 до 12)
— часы в 24-часовом формате с ведущими нулями (от 00 до 23)
— минуты с ведущими нулями (от 00 до 59)
— секунды с ведущими нулями (от 00 до 59)
— представляют нижний регистр ante meridiem и post meridiem ( или )
— обозначает верхний регистр Ante meridiem и Post meridiem ( или )

PHP-код в следующем примере отображает дату в разных форматах:

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CURTIME
DATE
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CHAR
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Concat with +
CONCAT_WS
DATALENGTH
DIFFERENCE
FORMAT
LEFT
LEN
LOWER
LTRIM
NCHAR
PATINDEX
QUOTENAME
REPLACE
REPLICATE
REVERSE
RIGHT
RTRIM
SOUNDEX
SPACE
STR
STUFF
SUBSTRING
TRANSLATE
TRIM
UNICODE
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Numeric Functions:
ABS
ACOS
ASIN
ATAN
ATN2
AVG
CEILING
COUNT
COS
COT
DEGREES
EXP
FLOOR
LOG
LOG10
MAX
MIN
PI
POWER
RADIANS
RAND
ROUND
SIGN
SIN
SQRT
SQUARE
SUM
TAN

Date Functions:
CURRENT_TIMESTAMP
DATEADD
DATEDIFF
DATEFROMPARTS
DATENAME
DATEPART
DAY
GETDATE
GETUTCDATE
ISDATE
MONTH
SYSDATETIME
YEAR

Advanced Functions
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COALESCE
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MS Access Functions
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Chr
Concat with &
CurDir
Format
InStr
InstrRev
LCase
Left
Len
LTrim
Mid
Replace
Right
RTrim
Space
Split
Str
StrComp
StrConv
StrReverse
Trim
UCase

Numeric Functions:
Abs
Atn
Avg
Cos
Count
Exp
Fix
Format
Int
Max
Min
Randomize
Rnd
Round
Sgn
Sqr
Sum
Val

Date Functions:
Date
DateAdd
DateDiff
DatePart
DateSerial
DateValue
Day
Format
Hour
Minute
Month
MonthName
Now
Second
Time
TimeSerial
TimeValue
Weekday
WeekdayName
Year

Other Functions:
CurrentUser
Environ
IsDate
IsNull
IsNumeric

SQL Quick Ref

Usage Example

Example SELECT statement calling each current date function.

-- Current Datetime
SELECT 
   GETDATE()         as 'GETDATE()'  
  ,CURRENT_TIMESTAMP as 'CURRENT_TIMESTAMP' 
  ,SYSDATETIME()     as 'SYSDATETIME()'; 

--UTC and Time zone Offset
SELECT  
   SYSDATETIMEOFFSET() as 'SYSDATETIMEOFFSET()'  
  ,GETUTCDATE()        as 'GETUTCDATE()' 
  ,SYSUTCDATETIME()    as 'SYSUTCDATETIME()';  
GO

Results: The first result shows the current local time of the
server and the different precisions. The second result shows the current time with
the time zone offset and UTC date times with different precisions. The
actual results will vary based on your server time and time zone.

YEARWEEK(date), YEARWEEK(date,mode)

Returns the year and the week for a date. The mode argument works exactly like the mode argument to the WEEK() function. The year in the result may be different from the year in the date argument for the first and the last week of the year.

mysql> SELECT YEARWEEK('1987-01-01');
+---------------------------------------------------------+
| YEAR('98-02-03')YEARWEEK('1987-01-01')                  |
+---------------------------------------------------------+
| 198653                                                  |
+---------------------------------------------------------+
1 row in set (0.00 sec)

Note − The week number is different from what the WEEK() function would return (0) for optional arguments 0 or 1, as WEEK() then returns the week in the context of the given year.

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Sql — date functions

Date Function CAST

Example of CAST(): Compare cast and convert and basic Cast to date and
datetime.

Wrap Up

Next Steps

Related Articles

Popular Articles

About the author

TIME_FORMAT(time,format)

SQL Справочник

SQL Справочник

CURTIME()

SQL Справочник

MySQL

What’s the Difference Between NOW, SYSDATE and CURRENT_DATE in MySQL?

SQL Справочник

SQL Server

CURRENT_TIMESTAMP vs GETDATE

How to Get Just the Current Date in SQL Server

Форматирование даты и времени с помощью PHP-функции date()

SQL Учебник

SQL Справочник

SQL Учебник

SQL Учебник

SQL References

Usage Example

YEARWEEK(date), YEARWEEK(date,mode)

SQL Учебник

Sql — date functions

Date Function CAST

Example of CAST(): Compare cast and convert and basic Cast to date and datetime.

Wrap Up

Next Steps

Related Articles

Popular Articles

About the author

TIME_FORMAT(time,format)

SQL Справочник

SQL Справочник

CURTIME()

SQL Справочник

MySQL

What’s the Difference Between NOW, SYSDATE and CURRENT_DATE in MySQL?

SQL Справочник

SQL Server

CURRENT_TIMESTAMP vs GETDATE

How to Get Just the Current Date in SQL Server

Форматирование даты и времени с помощью PHP-функции date()

SQL Учебник

SQL Справочник

SQL Учебник

SQL Учебник

SQL References

Usage Example

YEARWEEK(date), YEARWEEK(date,mode)

SQL Учебник

Example of CAST(): Compare cast and convert and basic Cast to date and
datetime.