Shows the time remaining in the current Ingress checkpoint and septicycle, and the times of upcoming checkpoints.Version 0.2.1 update: A change has been made in an attempt to fix the problem with the style disappearing in a recent Chrome update. This may or may not work, because the problem can't be reproduced in development mode. If it doesn't work, I will continue to investigate.
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Doesn't this violate the Ingress Terms of Service?
No. This extension does not contact any servers or interact with any external web pages to perform its function. It is 100% compliant with the Ingress ToS.
How does it work, then?
It computes the difference between the current time and the start time of a known past septicycle. (May 12, 2014 2:00:00 UTC, if you must know.) This depends entirely on your own system clock and not Niantic servers. (This also means that it will only be as accurate as your system clock.)
What about time zones?
Checkpoints occur in all cells on the planet simultaneously, so your time zone makes no difference in the computation. Times are displayed in the time zone dictated by your system settings.
Reviews of Septicycle Countdown for Ingress extension