Calculate number of months between two dates in sql server

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  http://www.toadworld.com/platforms/sql-server/w/wiki/10245.built-in-functions-date-and-time-functions
The DATEPART function returns an integer representing any of the following parts of the supplied date: year, quarter, month, day of the year, day, week number, weekday number, hour, minute, second, or millisecond. However, the time difference between December 31st 2002 and January 1st 2003 is only 24 hours; so if you care about accuracy then be sure to use the smallest fraction of the time possible when using DATEDIFF

  http://blog.sqlauthority.com/2007/08/18/sql-server-find-last-day-of-any-month-current-previous-next/
This lead into a situation where user really wanted to enter the value 1234567.89 but ended up with 1.23456789 and vice versa when I displayed values I got from a Web Service. If it is the 5th, go back 5 days which puts you on the last day of the previous month, regardless of how many days that month contains (leap year, 30 vs

  http://www.sqlteam.com/article/returning-a-week-number-for-any-given-date-and-starting-fiscal-month
Firstly we concatenate the year of our passed in date+1 to the passed in starting month and day 4 as an argument to the convert function to get a valid datetime value that we know is somewhere in week one for that year. In this article I will be looking at the three main date functions DATEADD, DATEPART and DATEDIFF (there is a fourth called DATENAME but I want to get to the end of this article before you fall asleep so I decided to leave it for another date and time! And no it doesn't foretell the name of your future blind date so it's not as interesting as it sounds anyway) Then I will be combining all three in a user defined function of our own by which time our necks will be well and truly stretched!" Sql Server comes with a host of built in functions such as ISNULL, CONVERT and CAST

Using DATEADD and DATEDIFF to calculate SQL Server datetime values

  http://searchsqlserver.techtarget.com/tip/Using-DATEADD-and-DATEDIFF-to-calculate-SQL-Server-datetime-values
Here are the results generated by the SELECT statement: OrderID OrderDate DelivDate 1002 2008-08-27 13:40:22.357 2008-09-06 13:40:22.357 As expected, the DelivDate value is 10 days later than the OrderDate value. Big data projects go beyond IT infrastructure Big data creates a big test for enterprises: finding the right employees who can meld the technology and business needs in a way ..

Calculating number of full months between two dates in SQL - Stack Overflow

  http://stackoverflow.com/questions/1106945/calculating-number-of-full-months-between-two-dates-in-sql
SELECT DATEDIFF(MONTH, '2009-04-16', '2009-05-15') but instead of giving me full months between the two date, it gives me the difference of the month part, i.e. To get it to do what you want, you need to make an additional adjustment to account for when the dates cross a boundary but don't complete the full span