## How to find the number of days between two dates

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I have a basic query:

```SELECT dtCreated
, bActive
, dtLastPaymentAttempt
, dtLastUpdated
, dtLastVisit
FROM Customers
WHERE (bActive = 'true')
AND (dtLastUpdated > CONVERT(DATETIME, '2012-01-0100:00:00', 102))
```

I want to add another column to the output... lets call it "Difference" to find out the number of days between 'dtcreated' and 'dtlastupdated' So for example if record 1 has a dtcreated of 1/1/11 and dtlastupdated is 1/1/12 the "Difference" column would be "365".

Can this be accomplished in a query?

You would use `DATEDIFF`:

```declare @start datetime
declare @end datetime

set @start = '2011-01-01'
set @end = '2012-01-01'

select DATEDIFF(d, @start, @end)

results = 365
```

```SELECT dtCreated
, bActive
, dtLastPaymentAttempt
, dtLastUpdated
, dtLastVisit
, DATEDIFF(d, dtCreated, dtLastUpdated) as Difference
FROM Customers
WHERE (bActive = 'true')
AND (dtLastUpdated > CONVERT(DATETIME, '2012-01-0100:00:00', 102))
```

Date Duration Calculator: Days Between Dates, For information about the DAY function, see DAY function. Description. Returns the number of days between two dates. Syntax. DAYS(end_date, start_date). Birthday Calculator – Find when you are 1 billion seconds old. Week Number Calculator – Find the week number for any date. Date/calendar related services – Overview. Calendar Generator – Create a calendar for any year. The World Clock – Current time all over the world. Countdown to any date.

To find the number of days between two dates, you use:

```DATEDIFF ( d, startdate , enddate )
```

Calculate The Number Of Days, Months Or Years Between Two Dates, Learn how to calculate number of days between two dates in Excel 2016 - Office 365. two Duration: 2:37 Posted: Nov 20, 2016 Days function gives you the number of days between two dates. This means that if the dates are 1 Dec 2017 and 2 Dec 2017, it will return 1. If you want both the days to be counted, you need to add 1 to the result of Days function. You can read more about the Days function here.

I would use the DATE_DIFF function to provide this value as below:

```SELECT dtCreated
, bActive
, dtLastPaymentAttempt
, dtLastUpdated
, dtLastVisit
, DATEDIFF(d, dtLastUpdated, dtCreated) AS Difference
FROM Customers
WHERE (bActive = 'true')
AND (dtLastUpdated > CONVERT(DATETIME, '2012-01-0100:00:00', 102))
```

EDIT: IF using MySQL you omit the 'd' leaving you with

```DATEDIFF(dtLastUpdated, dtCreated) AS Difference
```

Calculate Duration Between Two Dates – Results, Finding the number of Days between two Dates. Alissa Carter. Loading Unsubscribe from Duration: 3:57 Posted: Mar 12, 2014 Date Calculators. Duration Between Two Dates – Calculates number of days. Time and Date Duration – Calculate duration, with both date and time included. Date Calculator – Add or subtract days, months, years. Birthday Calculator – Find when you are 1 billion seconds old.

If you are using MySQL there is the DATEDIFF function which calculate the days between two dates:

```SELECT dtCreated
, bActive
, dtLastPaymentAttempt
, dtLastUpdated
, dtLastVisit
, DATEDIFF(dtLastUpdated, dtCreated) as Difference
FROM Customers
WHERE (bActive = 'true')
AND (dtLastUpdated > CONVERT(DATETIME, '2012-01-0100:00:00', 102))
```

Calculate the difference between two dates - Excel, This tutorial will teach you a few quick and easy ways to find out how many  Another way to count days between dates in Excel is by using the DATEDIF function, which is specially designed to work out the date difference in various units, including days, months and years. To get the number of days between 2 dates, you supply the start date in the first argument, end date in the second argument, and "d" unit in the last argument:

```DATEDIFF(d, 'Start Date', 'End Date')
```

do it

DAYS function - Office Support - Microsoft Office Support, Calculating the number of days using Excel is pretty simple. Just use a formula to subtract the later date from the earlier date. For example, if cell A1 contains 1  A Better and Simple solution is to count total number of days before dt1 from i.e., total days from 00/00/0000 to dt1, then count total number of days before dt2. Finally return the difference between two counts.

How to Calculate Number of Days between two Dates in Excel 2016 , With a start date in A1 and end date in B1, =DAYS(B1,A1) will return the days between the two dates. Purpose. Get days between dates. Return value. A number  The easiest way to calculate the number of days between the two specified dates is to subtract the start date from the end date. Below formula would work in this case: = B2 - B1 Another way to calculate the same is to use the DAYS function.

Finding the number of Days between two Dates, Example, a task can not be worked on the start and end date. Days between dates by duration. Determining the number of days between dates has many uses. This free online calculator allows you to calculate the number of working days available between two calendar dates,to run a business. Code to add this calci to your website Just copy and paste the below code to your webpage where you want to display this calculator.

Calculate number of days between two dates in Excel, The formula is in F9. The “d” returns the number of full days between the two dates.

• @Shmewnix what is the datatype for `dtCreated` and `dtLastUpdated`? If they are not datetime, then you will need to convert them.
• You would need to convert them in the `datediff` statement.