Ruby/Rails:将日期转换为 UNIX 时间戳 [英] Ruby/Rails: converting a Date to a UNIX timestamp

问题描述

如何从 Rails 应用程序中的 Date 对象获取 UNIX 时间戳(自 1970 GMT 以来的秒数)?

How would I get a UNIX timestamp (number of seconds since 1970 GMT) from a Date object in a Rails app?

我知道 Time#to_i 返回一个时间戳，但是执行 Date#to_time 然后获取时间戳会导致大约一个月的时间(不知道为什么...).

I know Time#to_i returns a timestamp, but doing Date#to_time and then getting the timestamp results in something that's off by about a month (not sure why...).

感谢任何帮助，谢谢！

好的，我想我想通了——我在一个循环中多次处理一个日期，每次由于时区不匹配而移动了一点日期，最终导致我的时间戳是一个月的时间.不过，我很想知道是否有任何方法可以在不依赖 Date#to_time 的情况下做到这一点.

OK, I think I figured it out- I was processing a date several times in a loop, and each time the date was moved a little because of a time zone mismatch, ultimately leading to my timestamp being a month off. Still, I'd be interested in knowing if there's any way to do this without relying on Date#to_time.

推荐答案

代码 date.to_time.to_i 应该可以正常工作.下面的 Rails 控制台会话显示了一个示例:

The code date.to_time.to_i should work fine. The Rails console session below shows an example:

>> Date.new(2009,11,26).to_time
=> Thu Nov 26 00:00:00 -0800 2009
>> Date.new(2009,11,26).to_time.to_i
=> 1259222400
>> Time.at(1259222400)
=> Thu Nov 26 00:00:00 -0800 2009

请注意，中间 DateTime 对象是本地时间，因此时间戳可能与您的预期相差几个小时.如果你想在UTC时间工作，你可以使用DateTime的方法to_utc".

Note that the intermediate DateTime object is in local time, so the timestamp might be a several hours off from what you expect. If you want to work in UTC time, you can use the DateTime's method "to_utc".

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