Best overlap: 8:00 AM to 9:00 AM in Manchester is 5:00 PM to 6:00 PM in Tokyo.
8:00 AM to 9:00 AM in Manchester is when Tokyo is also working, at 5:00 PM to 6:00 PM their time. Because Tokyo is 9 hours ahead of Manchester, the shared window is only about 1 hour. A fixed slot at 8:00 AM in Manchester (5:00 PM in Tokyo) saves a lot of back-and-forth. Heads up: because Manchester changes its clocks and Tokyo doesn't, the difference moves by an hour twice a year. Confirm the overlap around the DST switch.
An 8 AM Pacific launch is 5 PM in London and 1 AM in Sydney. Your blog post, your engineering on-call, your support team, and your Twitter schedule are all picking different hours. Here is how to plan a launch that does not embarrass you in any time zone. -
8 AM Tokyo is 4 PM in Los Angeles the day before. West Coast afternoon windows, the East Coast dead zone, and why the Philippines slot is an hour off. -
London to New York is five hours apart, except for the five weeks a year when it isn't. Exact overlap windows for every US zone, the 2026 DST mismatch dates, and where to put the recurring sync. -