Version 0.4 update: Informs the user about my new extension called Reference for Ingress that supersedes this one. You can get it here: https://chrome.google.com/webstore/detail/reference-for-ingress/mkkjeehbjghbhjnfekacndokjpinnhgk
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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.
Extore is a team of professionals who are passionate about creating extensions for web browsers. This devotion also gives us opportunity to appreciate work of other people. We get inspired by useful, open source extensions made by developers all over the world. Our strong belief is that one should share helpful add-ons with others. That’s why we’d like to present you our ever-growing list of favourite extensions that have inspired us. Moreover, as you probably have already learned, sometimes struggling for the best brings an end to the good. Talking about add-ons it often turns out that an upgrade is worse then previous version. Also it can become really tricky to get back to the beloved version of your favourite extension. That’s why we’re going to make not only the latest, but all versions of our favourite (and we hope yours too) add-ons available for download. No more compromises, just stick to the version you really like!