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19-Feb-2015 11:59

Operations from standard time zones to daylight savings time zones, and vice versa, are adjusted for a 24 hour period, with an apparent result of a 23 or 25 hour day.SQL Date Functions In this section, we cover common date functions seen in SQL.

*/ — To include the entire day of 2004-03-15 use the following two solutions — Results: 2014-01-23 .793 2014-01-23 .000 /******* VALID DATE RANGES FOR DATE/DATETIME DATA TYPES SMALLDATETIME date range: January 1, 1900 through June 6, 2079 DATETIME date range: January 1, 1753 through December 31, 9999 DATETIME2 date range (SQL Server 2008): January 1,1 AD through December 31, 9999 AD DATE date range (SQL Server 2008): January 1, 1 AD through December 31, 9999 AD *******/ — Selecting with CONVERT into different styles — Note: Only Japan & ISO styles can be used in ORDER BY GO /* First results Datetime Col Date Col 2014-12-25 .373 20141225 */ /* Second results: Datetime Col Date Col 2014-12-25 .000 20141225 */ /* Third results: Datetime Col Date Col 2014-12-26 .000 20141225 */ ———— — SQL month sequence – SQL date sequence generation with table variable — SQL Server cast string to datetime – SQL Server cast datetime to string — SQL Server insert default values method GO /* Partial results: Month Sequence Jan 1 2012 AM Feb 1 2012 AM Mar 1 2012 AM Apr 1 2012 AM */ ———— ———— — SQL Server Server datetime internal storage — SQL Server datetime formats ———— — SQL Server datetime to hex GO /* Results Table definition for the Employee table Note: Birth Date is string date (only) CREATE TABLE dbo.Employee( Full Name nvarchar(50) NOT NULL PRIMARY KEY, Birth Date char(8) NULL, Modified Date datetime NOT NULL ) */ GO /* Results Full Name Birth Date Modified Date Guy Gilbert 19720515 2009-01-03 .217 Kevin Brown 19770603 2009-01-03 .217 Rob Walters 19650123 2009-01-03 .217 Roberto Tamburello 19641213 2009-01-03 .217 Thierry D’Hers 19490829 2009-01-03 .217 */ — SQL Server age GO /* Results Full Name Age Row Maintenance Date Guy Gilbert 37 Jan 3 2009 AM Kevin Brown 32 Jan 3 2009 AM Rob Walters 44 Jan 3 2009 AM Roberto Tamburello 45 Jan 3 2009 AM Thierry D’Hers 60 Jan 3 2009 AM */ — SQL Server age of Rob Walters on specific dates — SQL Server string to datetime implicit conversion with DATEADD GO /* Results Important Note: age increments on Jan 1 (not as commonly calculated) Full Name Age DEC31 Age JAN01 Age JAN23 Age JAN24 Mod Date Rob Walters 49 50 50 50 */ ———— — SQL combine integer date & time into datetime ———— — Datetime format sql — SQL stuff GO /* Results Date As INT Time As INT Date Time Value 20121023 235959 2012-10-23 .000 20121023 10204 2012-10-23 .000 20121023 2350 2012-10-23 .000 201210-10-23 .000 20121023 50 2012-10-23 .000 20121023 6 2012-10-23 .000 */ ———— — SQL Server string to datetime, implicit conversion with assignment GO — Result: 2015-01-23 .000 /* SQL string date, assemble string date from datetime parts */ — SQL Server cast string to datetime – sql convert string date — SQL Server number to varchar conversion — SQL Server leading zeroes for month and day — SQL Server right string function GO /* Results Employee ID Rate Change Date 3 1997-12-12 .000 4 1998-01-05 .000 */ /* Equivalent to — SQL datetime range SELECT Employee ID, Rate Change Date FROM Adventure Works. Returns the time in the format HH: MM: SS of the start of the current transaction. Trailing zeros are dropped from fractional seconds.Fractional seconds are optional and may be specified by the precision value enclosed in parentheses. component of the timestamp date by the value of the interval.

The default Style values – Style 0 or 100, 9 or 109, 13 or 113, 20 or 120, and 21 or 121 – always return the century (yyyy) format.

— Microsoft SQL Server T-SQL date and datetime formats — Date time formats – mssql datetime — MSSQL getdate returns current system date and time in standard internal format — Result: Dec 29 2012 AM ———— — SQL Server date and time functions overview ———— — SQL Server CURRENT_TIMESTAMP function — SQL Server datetime functions — local NYC – EST – Eastern Standard Time zone — SQL DATEADD function – SQL DATEDIFF function ———— — T-SQL Date and time function application — CURRENT_TIMESTAMP and getdate() are the same in T-SQL ———— — SQL first day of the month — SQL first date of the month — SQL first day of current month – 2012-01-01 .000 /* Orders with Order Dates ‘2004-03-15 .000’ – 1 second after midnight (AM) ‘2004-03-15 .000’ – 1 minute after midnight ‘2004-03-15 .000’ – 1 hour after midnight are not included in the two queries above.