I have already looked into the following link and am not able to figure out a solution, Re- Custom Filled DMA Map using Richard#x27s Shape file utility. I have zip code level data that needs to be aggregated at DMA level and then mapped in a DMA boundary map. The DMA Code - A Standard Of Conduct For DMA Members.ĭMA to ZIP code mapping. Demographic and housing estimates in Rochester, NY. Use our zip code lookup by address feature to get the full 9-digit (ZIP 4) code. This list contains only 5-digit ZIP codes. Var june2 = new Date(temp.substring(0, temp.List of 33 Zip Codes in Boston, Massachusetts - Name Census. var june1 = new Date(rightNow.getFullYear(), 6, 1, 0, 0, 0, 0) If the offsets are the same, then we know that the location DOES NOT observe DST. If the offsets are different, then we know that the location observes DST. Since DST is always observed during the summer, we can compare the time offset between two dates in January, to the time offset between two dates in June. The second thing that you need to know is whether the location observes daylight savings time (DST) or not. Var jan2 = new Date(temp.substring(0, temp.lastIndexOf(" ")-1)) Var jan1 = new Date(rightNow.getFullYear(), 0, 1, 0, 0, 0, 0) Josh Fraser has a nice write up on it here var rightNow = new Date() If you want, you can also get a feel for the timezone by asking the browser If it's absolutely necessary to pay a subscription to a service in order to do this, then it will not be worth it and we will just have to ask users explicitly.Īlthough language isn't particularly relevant as I can probably convert things however needed, we're using PHP and MySQL. I've found a lot of zip code databases, and so far only a few contain time zone information, but those that do are not free, such as this one. I realize zip codes won't help with figuring out the time zone outside the US, but in that case we'd have to manually ask anyway, and we deal predominantly with the US regardless. They will be able to manually set the time zone later if our best guess is wrong. We are trying to minimize the amount of data we explicitly have to ask them for. What would be the best way to determine a good potential guess of their time zone from this zip code? When users register with our app, we are able to infer their zip code when we validate them against a national database.
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