Guild Wars 2 Wiki:Projects/World Boss Respawn timers
Below is a link to an Excel Spreadsheet. On this sheet is information for all servers to help you calculate the respawn times on the World Bosses: The Shatterer, Tequatl, and Claw of Jormag. Just read the directions and changes portion of the Spreadsheet and I request you to spread the word on the spreadsheet as well as update the date and time of the last kill. A special thanks to Korbben - Stormbluff Isle for creating the Spreadsheet, Laulani for info on 3 large chest events, and Etalel - Sorrow's Furnace for coding World Boss automatic respawn timer.
Here is the link. 
Enjoy!!! Do remember to spread the word. The more people we have updating and watching, the less zone spam we will have.
Etalel - Sorrow's Furnace TAG Edo.1095