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Insert Random Date within Range into MySQL

Posted on 2009-05-13
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Last Modified: 2012-05-06
Title is pretty self explanatory. I just want to use MySQL command line only to insert a random date into rows. The catch is the date needs to be random, but also within the range of the Last 2 years. Any help would be much appreciated.
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Question by:chrismdoyle
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8 Comments
 
LVL 39

Accepted Solution

by:
Roger Baklund earned 2000 total points
ID: 24375688
Try this:
select curdate() - interval rand()*365*2 day

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LVL 14

Expert Comment

by:racek
ID: 24375746
SELECT DATE_SUB(NOW() ,INTERVAL FLOOR(1 + (RAND() * 200), day)
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LVL 14

Expert Comment

by:racek
ID: 24375874
sorry
SELECT curdate() -  FLOOR(1 +  (RAND() * 730)) ;
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Author Comment

by:chrismdoyle
ID: 24375880
I'll try these now, additionally, if I wanted to make sure that the date range was within 1-2 years, but nothing newer than 1 year?
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LVL 14

Expert Comment

by:racek
ID: 24375937
this is for 2 years back
SELECT curdate() -  FLOOR(1 +  (RAND() * 730)) ;
100 days ahead
SELECT curdate() +  FLOOR(1 +  (RAND() * 100)) ;
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Author Comment

by:chrismdoyle
ID: 24376104
CXR's implementation is by far the best. It produces output like 2009-03-30. Instead of a string of #'s. CXR, do you know how to get a random time to appear with that as well?
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Author Comment

by:chrismdoyle
ID: 24376167
Ok, here's the way to do it to have a random day and time:


select NOW() - interval rand()*365*2 day

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LVL 39

Expert Comment

by:Roger Baklund
ID: 24377190
>> if I wanted to make sure that the date range was within 1-2 years, but nothing newer than 1 year?

Subtract 1 year and then subtract a random number of days between 0 and 365:
select curdate() - interval 1 year - interval rand()*365 day;

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