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*Edited, copied the wrong query* 
 
You can use a CTE for this: 

<pre><code class="code-10 nolinks" id="code-20-42722348-1">DECLARE @table TABLE (personID INT, Startdate DATETIME, Enddate DATETIME)

INSERT INTO @table (personID,Startdate,Enddate)
VALUES (1,'2017-01-10','2017-02-10')
INSERT INTO @table (personID,Startdate,Enddate)
VALUES (2,'2018-06-14','2018-06-29')

;with cte AS (
	SELECT personId,Startdate,DATEADD(DAY,6,Startdate) AS Enddate
	FROM @table
	UNION ALL
	SELECT personId,DATEADD(DAY,1,Enddate) AS Startdate,
		CASE WHEN DATEADD(DAY,7,Enddate) &lt;= (SELECT Enddate FROM @table WHERE personID = cte.personID) 
		THEN DATEADD(DAY,7,Enddate)
		ELSE (SELECT Enddate FROM @table WHERE personID = cte.personID) END AS Enddate
	FROM cte
	WHERE Enddate &lt; (SELECT Enddate FROM @table WHERE personID = cte.personID)
) 
SELECT * 
FROM cte
ORDER BY personID,Startdate,Enddate
</code></pre>
 
Results: 
<a href="https://filedb.experts-exchange.com/incoming/2018/10_w44/1398588/cte2.png" target="_blank" title="cte2.png (9 KB)"><img alt="cte2.png" class="file-block lazyload" style="max-width: 560px;" data-src="https://filedb.experts-exchange.com/incoming/2018/10_w44/1398588/cte2.png" /></a><a href="https://filedb.experts-exchange.com/incoming/2018/10_w44/1398587/cte2.png" target="_blank" class="file-inline" title="cte2.png (9 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>cte2.png</a>
</div>

cte2.png

Data Analyst

Jolynn Haney

<div>
Thanks so much - both solutions worked, but I just needed to tweak Dustin's solution so that the new Startdate is one day greater then the previous Enddate (not the same as).
</div>

<div>
<div class="content wysiwyg-content">
Hello 
I am trying to break a larger date range into a set of smaller 7-day date ranges so that I can identify events that occur at least once within each 7-day range. 
 
For example: 
 
personID &nbsp; &nbsp; Startdate &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Enddate 
1 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;2017-01-01 &nbsp; &nbsp; &nbsp;2017-02-10 
2 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 2018-06-14 &nbsp; &nbsp; &nbsp;2018-06-29 
 
This is my desired output. 
 
personID &nbsp; &nbsp; Startdate &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Enddate 
1 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;2017-01-10 &nbsp; &nbsp; &nbsp;2017-01-16 
1 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;2017-01-17 &nbsp; &nbsp; &nbsp;2017-01-23 
1 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;2017-01-24 &nbsp; &nbsp; &nbsp;2017-01-30 
1 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;2017-01-31 &nbsp; &nbsp; &nbsp;2017-02-06 
1 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;2017-02-07 &nbsp; &nbsp; &nbsp;2017-02-10 
2 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;2018-06-14 &nbsp; &nbsp; &nbsp;2018-06-20 
2 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;2018-06-21 &nbsp; &nbsp; &nbsp;2018-06-27 
2 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;2018-06-28 &nbsp; &nbsp; &nbsp;2018-06-29 
 
Note that that last date range may be shorter than 7 days as in the above example. 
I am able to break the range in to calendar weeks, but I am stuck on how to break the range into 7 days periods that are independent of calendar weeks. 
 
I appreciate your help - thanks!
</div>
</div>

Hello 
I am trying to break a larger date range into a set of smaller 7-day date ranges so that I can identify events that occur at least once within each 7-day range.

For example:

personID     Startdate           Enddate
1                    2017-01-01      2017-02-10
2                   2018-06-14      2018-06-29

This is my desired output. 

personID     Startdate           Enddate
1                    2017-01-10      2017-01-16
1                    2017-01-17      2017-01-23
1                    2017-01-24      2017-01-30
1                    2017-01-31      2017-02-06
1                    2017-02-07      2017-02-10
2                    2018-06-14      2018-06-20
2                    2018-06-21      2018-06-27
2                    2018-06-28      2018-06-29

Note that that last date range may be shorter than 7 days as in the above example.
I am able to break the range in to calendar weeks, but I am stuck on how to break the range into 7 days periods that are independent of calendar weeks. 

I appreciate your help - thanks!

Break large date range in to smaller 7-day date ranges

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