从纬度经度到GMT的时间偏移的粗略估算 [英] rough estimate of the time offset from GMT from latitude longitude

问题描述

是否有一种方法可以从纬度/经度估算距格林尼治标准时间(或时区)的偏移量?我见过地名，但是这需要长期工作，我们真的不希望依赖Web服务.它只是用于确定在向各种用户提供信息时是显示今天"还是今晚"，因此它不需要太准确(一两个小时的时间就不错了).

Is there a way to estimate the offset from GMT (or time zone) from a latitude/longitude? I've seen geonames, but this would need to work long term and we don't really want to rely on a web service. It'd just be used for determining whether to display "today" or "tonight" when giving information to various users so it wouldn't need to be too accurate (an hour or two off wouldn't be bad).

推荐答案

offset = direction * longitude * 24 / 360

其中方向为东1，西为-1，经度为(-180,180)

where direction is 1 for east, -1 for west, and longitude is in (-180,180)

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