FAQ - Time Zones

Google saves all the calendars in one time:  UTC, Zulu in the military. Here's an entire calendar ics file.

You'll note all the times below in the short calendar sample "basic.ics" end with a 'Z' for Zulu:

basic.ics:

BEGIN:VCALENDAR

PRODID:-//Google Inc//Google Calendar 70.9054//EN

VERSION:2.0

CALSCALE:GREGORIAN

METHOD:PUBLISH

BEGIN:VEVENT

DTSTART:20240907T233100Z

DTSTAMP:20250312T033817Z

UID:03vjihlm29rg4qoiohilj9l2r0@google.com

CREATED:20240907T224115Z

DESCRIPTION:Moon Quincunx Jupiter - Time to show some restraint. Grandiosit

 y is not appealing. Neither is excess. With a little self-control you can r

 eap rewards.

LAST-MODIFIED:20240907T224115Z

SEQUENCE:0

STATUS:CONFIRMED

SUMMARY:Moon Quincunx Jupiter

TRANSP:OPAQUE

END:VEVENT

END:VCALENDAR

See this page for how UTC works:   https://en.wikipedia.org/wiki/List_of_tz_database_time_zones

Our Google calendars are stored in "one time" for everyone, everything, everywhere (on earth). 

All modern computers, phones and software have got it very organized.

Your computers and phone auto-sync time (unless you disable it). The calendars we provide are all in Zulu Time.  You can download any of our calendars and they always are if the filename ends in ".ics".

Yes, calendars in ics format can be stored in timezones other than Zulu, but we don't use that feature.

Your calendar program adjusts locally. Check your phone and make sure it's using your local time zone. 

All the future time changes have been provided to companies in advance for all the many time zones in the world. You can see them all on that wiki page. It's all published in advance.

Going back in time - say to 1944, when casting a chart - can get tricky. Back then things weren't that organized with different counties in Illinois using different time zones. Plus adding 'war time' to the mix.

Check this out:   https://www.astro.com/faq/fq_de_timezone_i.htm

Time is an illusion. There is no time, only movement (modern quantum physics). We measure time using the movement of the solar system. 

Time and clocks are a way to keep in sync with what other people are doing. We all agree to use Daylight savings time if we live in the US, whether we want to or not.

It doesn't matter if you call it 'nine o'clock' - you could call it 'tomato hour'. As long as that jived with the rest of your peeps when planning an event, then it's working.