Adjust arrival time across time zones

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Re: Adjust arrival time across time zones

Postby AlanOfTheBerg » Wed Dec 19, 2012 6:47 pm

This has been discussed before with Waze and it would seem that this would be exceedingly difficult to do due to the non-linear nature of time zones and uncertainty about whether a particular country, state/province, county, or city subscribes to the use of daylight saving time. Crossing one time zone to another may not actually change time, or sometimes it does. I'm not sure there's a mathematical formula available like there is for dawn/dusk calculation.
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Re: Adjust arrival time across time zones

Postby AlanOfTheBerg » Sun Mar 09, 2014 5:39 am

shane8750 wrote:How about where to change time zone? It's always saying i'm arrive 5 hours ahead of what it is, but the minutes are correct. I never entered a time zone but can't find anywhere to correct the issue.

Please post a screenshot showing the wrong time ETA.
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Re: Adjust arrival time across time zones

Postby shaneracer » Sat Mar 08, 2014 2:11 am

How about where to change time zone? It's always saying i'm arrive 5 hours ahead of what it is, but the minutes are correct. I never entered a time zone but can't find anywhere to correct the issue.
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Re: Adjust arrival time across time zones

Postby speedlever » Mon Jul 13, 2015 2:23 pm

I just encountered this yesterday in a drive from Memphis, TN (Central) to NC (Eastern). The initial ETA was based on Memphis time. When I crossed the time zone boundary and the time reset on my phone, the ETA updated to the real ETA of the destination time zone.

I don't know why it would be difficult for Waze to know the destination time zone and display the correct ETA based on the destination time zone, not just when the device enters the destination time zone.

For the user that commutes from Knoxville to Nashville, I would expect your ETA would change accordingly too, once you enter the Central time zone. So what would the difference be if it shows the destination ETA from the beginning?

Basically, you can't share the ETA (accurately) until you cross the destination time zone boundary. IMO, the ETA should always be based on the destination time zone.

I have 3 NAV apps on my Galaxy S4: Waze, Maps, and Here. Of those, only Here provides the correct arrival time using the destination time zone. But it displays the drive as being an hour longer than either Waze or Maps. Go figure.
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Re: Adjust arrival time across time zones

Postby speedlever » Mon Jul 13, 2015 7:30 pm

Thanks for that info Rich. Perhaps it's not as simple as I thought! According to Google, there are multiple locations in the USA that do not observe DST:

"States and territories in the United States that do not observe daylight saving time, aside from most of Arizona, include: Hawaii, American Samoa, Guam, Puerto Rico, and the Virgin Islands. Some parts of Indiana did not observe daylight saving time in the past."

That being said, with all the data available online, I would think getting the current time status of a location should not be that difficult if I can be routed to it.
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Re: Adjust arrival time across time zones

Postby speedlever » Mon Jul 13, 2015 8:09 pm

I assume ROTW = rest of the world. Hmm. Oh well, it would be nice if the destination info included a time indicator indicating difference from GMT and when/if DST is observed. Then the app should have a simple job of calculating/displaying the ETA from that data. Perhaps that indicator is the missing link. ;)
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Re: Adjust arrival time across time zones

Postby taco909 » Mon Jul 13, 2015 4:34 pm

Within the NA server itself it would not be difficult.
DST is on a national schedule, and only Arizona balks, so it would not be difficult to localize it for North America.
Outside of NA, not all countries observe it, and some countries are not on the standard 24-hour zone system anyways, some being off by 15-30 minutes from the ROTW.

So the program logic is looking only at the phone's internal time source, trusting that it will match the user's locale.

So this is something that could easily be done on the NA server (or the Western Hemisphere for that matter, but that would involve the ROTW server). Global implementation would be quite the undertaking, particularly in the Middle East.
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Re: Adjust arrival time across time zones

Postby taco909 » Mon Jul 13, 2015 8:04 pm

All of those places listed are, AFAIK, on the ROTW server... not 100% positive on Hawaii, but an editor who assists us in Los Angeles commented on some things behaving the same in Hawaii as on ROTW.
The territories and possessions are definitely on ROTW.
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Adjust arrival time across time zones

Postby Tlitf » Wed Dec 19, 2012 5:46 pm

Whenever I'm navigating to a destination that is in a different time zone from the one that I am in, the estimated arrival time is for the time zone I'm in. Can that be changed to the destination time zone?

E.g. I'm in Chicago. It's noon Chicago time. I'm navigating to Michigan, and it will take 2 hours to get there. When I arrive, it will be 3pm Michigan time. But the estimated arrival time says 2pm.
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Re: Adjust arrival time across time zones

Postby WeeeZer14 » Thu Dec 20, 2012 3:27 am

I live in Knoxville (Eastern) and travel monthly to Nashville (Central). I don't travel FOR work but I work while on these trips. At my work we all follow Eastern time, so even though I am in Central for 3 to 7 days a month, I am ALWAYS on Eastern time (phone, watch, car, computers, etc). So I for one do NOT want Waze to be smart. If I am driving somewhere and trying to get there in time for a 3 pm Eastern conference call, I don't want Waze doing any math for me.

I of course realize the case you mention is true and valid. I'm just saying we may need an option to turn it off as well.

For now people just need to realize that ETA arrival time = Device current time plus estimated travel time. Your arrival time will change as soon as your device updates its time once you cross into the next time zone.
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