I had the same problem and used the newest zen-cart-v1.5.5-03292016. I did not understand exactly how to fix so I will give a clear answer. Once you update to 1.5.2 delete the zc_install folder and rename your admin. Login to admin and go to tools>install SQL patches and paste
ALTER TABLE customers MODIFY COLUMN customers_password datetime NOT NULL default '0001-01-01 00:00:00';
ALTER TABLE customers MODIFY COLUMN customers_dob datetime NOT NULL default '0001-01-01 00:00:00';
UPDATE customers set customers_dob = '0001-01-01 00:00:00' where customers_dob = '0000-00-00 00:00:00';
UPDATE customers set customers_password = '0001-01-01 00:00:00' where customers_password = '0000-00-00 00:00:00';
then re-upload zc_install go to
www.yourdomain.com/zc_install and upgrade SQL and it went from 1.5.2 up to 1.5.5 with no problem. Many people may not have this problem but my cart was super old
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