给定位置的本地时间是时间戳参数和dstOffset和rawOffset字段的总和
timestamp + dstOffset + rawOffset = UTC的本地时间(以秒为单位)
问题我试图让当地时间在正确的时区。 我以为新的Date(timestamp + dstOffset + rawOffset * 1000)将以UTC返回本地时间,而是发现实际的数值确实在本地时间,在错误的时区(UTC)中。
示例:timestamp: 1456349190
可读时间戳: 新日期(1456349190 * 1000).toGMTString()(Wed,24 Feb 2016 21:26 :30 GMT)
maps.googleapis/maps/api/timezone/json?location=39.2079206,-84.5274616& ; timestamp = 1456349190& key = $ {googleApiKey}
返回:
- dstOffset :0
- rawOffset :-18000
- timeZoneId :America / New_York
数据:
以秒为单位 = 1456349190 + 0 +(-18000)= 1456331190
以毫秒为单位的总和 = 1456331190 * 1000 = 1456331190000
假定本地日期 = 新日期(1456331190000).toGMTString()(Wed,24 Feb 2016 16:26:30 GMT)
问题t 可读时间戳和假定的本地日期是相同的,因为它们都是UTC? 似乎假定的本地日期应该是Wed,24 Feb 2016 16:26:30 EST
这是否正确?
如果是这样,我似乎只需要从假定的本地日期中提取需要的值(本地小时)并应用从google api timeZoneId (America / New_York)返回的正确时区,因为16:26:30是我需要的正确的本地时间。
有用的提示这些是帮助我更好地了解时间戳的一些指导原则:
Google API告诉您,rawOffset的位置为-18000
当您使用时间戳计算日期时,应以UTC为单位。 因为Date类将时间戳视为UTC。
在您的解释中,值1456331190000是本地时间戳,但是 Date类将该值视为UTC。
这是您的错误。
这是代码(在Node.js中)
Google Docs says:
The local time of a given location is the sum of the timestamp parameter, and the dstOffset and rawOffset fields from the result.
timestamp + dstOffset + rawOffset = local time in seconds in UTC
ProblemI am trying to get the local time in the correct time zone. I thought that new Date(timestamp + dstOffset + rawOffset *1000) would return the local time in UTC, but instead I find that the actual numerical values are indeed in local time, in the wrong time zone (UTC).
Example:timestamp: 1456349190
readable timestamp: new Date(1456349190*1000).toGMTString() (Wed, 24 Feb 2016 21:26:30 GMT)
maps.googleapis/maps/api/timezone/json?location=39.2079206,-84.5274616×tamp=1456349190&key=${googleApiKey}
Returns:
- dstOffset: 0
- rawOffset: -18000
- timeZoneId: America/New_York
Data:
Sum in seconds = 1456349190 + 0 + (-18000) = 1456331190
Sum in milliseconds = 1456331190*1000 = 1456331190000
Supposed Local Date = new Date(1456331190000).toGMTString() (Wed, 24 Feb 2016 16:26:30 GMT)
QuestionShouldn't readable timestamp and Supposed Local Date be the same since both are in UTC? Seems like Supposed Local Date should really be Wed, 24 Feb 2016 16:26:30 EST
Is this correct?
If so it seems like I just need to extract the values I need (local hour) from Supposed Local Date and apply the correct time zone returned from google api timeZoneId (America/New_York) because 16:26:30 is the correct local time I need.
Helpful TipsThese are some guidelines that helped me understand timestamp better:
"The unix timestamp isn't affected by a timezone setting. Setting the timezone only affects the interpretation of the timestamp value."
解决方案Timestamp value indicates the seconds since 1/1/1970 UTC. Not local timestamp.
The Google API tells you the rawOffset of location is "-18000"
When you calculate the date with timestamp, you should align the unit in UTC. Because Date class treats the timestamp as UTC.
In your explanation, the value 1456331190000 is a local timestamp, but the Date class treats the value as UTC.
This is your mistake point.
Here is the code (in Node.js)
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