All timers (with exception of Gather Day) are based on Game Time 08:00 giving you enough time to speed up for one of the hourly challenges in the first 8 hours.
To effectively use this page, try to start builds / tech that last longer or slightly less than the timer so that they will finish on their respective days.
Building Day Timer (Set to Expire on Build Day at 08:00)
Tech Day Timer (Set to Expire on Tech Day at 08:00)
Free Dev Day Timer (Set to Expire on Free Dev Day at 08:00)