# next week's birthdays (inclusive)
SELECT * FROM `users` WHERE
 DATE_FORMAT(`birthdate`, '%m%d') >= DATE_FORMAT(NOW(), '%m%d') AND
 DATE_FORMAT(`birthdate`, '%m%d') <= DATE_FORMAT(DATE_ADD(NOW(), INTERVAL 7 DAY), '%m%d')
 ORDER BY DATE_FORMAT(`birthdate`, '%m%d') ASC;
 # 28 total, Query took 0.0309 sec - 1000 row table

Don't forget that if you want to sort the birthdays by birthday (aka day) you'll need to eliminate the year from the sort order or MySQL wll order things using the year too. That's why my ORDER in these sample queries are ORDER BY DATE_FORMAT(birthdate, '%m%d') ASC.

# last week's birthdays (inclusive)
SELECT * FROM `users` WHERE
 DATE_FORMAT(`birthdate`, '%m%d') <= DATE_FORMAT(NOW(), '%m%d') AND
 DATE_FORMAT(`birthdate`, '%m%d') >= DATE_FORMAT(DATE_SUB(NOW(), INTERVAL 7 DAY), '%m%d')
 ORDER BY DATE_FORMAT(`birthdate`, '%m%d') ASC;
 # 20 total, Query took 0.0469 sec - 1000 row table

If anyone knows of a more efficent way to set this up, let me know. I haven't run any extensive benchmarks and don't intend on it any time soon. If you do, send your responses this way!

@mark - Oh, I know this one, give me a little bit to find this snippet somewhere in my library and I'll post it right up!

"Unfortunately there is no query to convert and update all 1000 users birthday (datetime data type) with the data from dob (Unix time stamp stored as INT)"

How about this?

UPDATE users SET birthdate=from_unixtime(dob);

How would I get all the birthdays for tomorrow or all the birthdays for the next week/month?

Would I have to use PHP to set the time range or can i do it with one quick query????