- 2020-07-14: Made the site more secure with SSL, changed to Responsive theme and replaced plugin Easy WP LaTeX with KaTeX.
- 2016-12-21: Moved the site to a new server at Crystone.
- 2012-10-04: Changed the base theme from WP Twenty Eleven to Twenty Twelve and the child theme from ohw2011 to ohw2012.
- 2012-09-03: Rendered formulas in Theory of hca tuning with Easy WP LaTeX.
- 2012-08-28: Reinstall of WordPress to a new location. This required another relocation of all the files.
- 2012-08-13: Changed from ordinary PHP/CSS to WordPress. This required changes to the layout and relocation of all the files.
- 2012-08-11: Moved the site to a new server and deleted some outdated files.
- 2006-11-19: Updated files to XHTML 1.0 Transitional.
- 2006-06-26: Major revision of Theory of hca tuning.
- 2006-01-31: Redesigned Theory of hca tuning.
- 2005-11-23: Started redesigning with CSS.
- 2004-08-15: Added articles on hca tuning.
- 2003-09-01: Moved the site to Crystone.
- 2002-08-01: Created the site (hosted by Telia).