Today, we announced that we improved the Amazon Time Sync Service to microsecond-level clock accuracy on supported Amazon EC2 instances. This new capability adds a local reference clock to your EC2 instance and is designed to deliver clock accuracy in the low double-digit microsecond range within your instance’s guest OS software. This post shows you how to connect to the improved clocks on your EC2 instances. This post also demonstrates how you can measure your clock accuracy and easily generate and compare timestamps from your EC2 instances with ClockBound, an open source daemon and library. Read the full update here.