Ruby/Rails：将日期转换为 UNIX 时间戳
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/1805950/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Ruby/Rails: converting a Date to a UNIX timestamp
提问by igul222
How would I get a UNIX timestamp (number of seconds since 1970 GMT) from a Date object in a Rails app?
如何从 Rails 应用程序中的 Date 对象获取 UNIX 时间戳（自格林威治标准时间 1970 以来的秒数）？
I know Time#to_ireturns a timestamp, but doing Date#to_timeand then getting the timestamp results in something that's off by about a month (not sure why...).
我知道Time#to_i返回一个时间戳，但是这样做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......）。
Any help is appreciated, thanks!
任何帮助表示赞赏，谢谢！
Edit: 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.
编辑：好的，我想我想通了 - 我在循环中多次处理日期，并且每次由于时区不匹配而稍微移动日期，最终导致我的时间戳关闭一个月。不过，我很想知道是否有任何方法可以在不依赖Date#to_time.
回答by David Grayson
The code date.to_time.to_ishould work fine. The Rails console session below shows an example:
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：
>> 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
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".
请注意，中间 DateTime 对象是本地时间，因此时间戳可能与您期望的时间相差几个小时。如果您想在 UTC 时间工作，您可以使用 DateTime 的方法“to_utc”。
回答by Ryan Bigg
I get the following when I try it:
当我尝试时，我得到以下信息：
>> Date.today.to_time.to_i
=> 1259244000
>> Time.now.to_i
=> 1259275709
The difference between these two numbers is due to the fact that Datedoes not store the hours, minutes or seconds of the current time. Converting a Dateto a Timewill result in that day, midnight.
这两个数字之间的差异是由于Date不存储当前时间的小时、分钟或秒的事实。将 a 转换Date为 aTime将导致当天午夜。
回答by Gerry
The suggested options of using to_utcor utcto fix the local time offset does not work. For me I found using Time.utc()worked correctly and the code involves less steps:
使用to_utc或utc修复本地时间偏移的建议选项不起作用。对我来说，我发现 usingTime.utc()工作正常，代码涉及的步骤更少：
> Time.utc(2016, 12, 25).to_i
=> 1482624000 # correct
vs
对比
> Date.new(2016, 12, 25).to_time.utc.to_i
=> 1482584400 # incorrect
Here is what happens when you call utc after using Date....
这是在使用Date....后调用 utc 时发生的情况。
> Date.new(2016, 12, 25).to_time
=> 2016-12-25 00:00:00 +1100 # This will use your system's time offset
> Date.new(2016, 12, 25).to_time.utc
=> 2016-12-24 13:00:00 UTC
...so clearly calling to_iis going to give the wrong timestamp.
...所以很明显调用to_i会给出错误的时间戳。
回答by Nowaker
Solution for Ruby 1.8 when you have an arbitrary DateTime object:
当您拥有任意 DateTime 对象时，Ruby 1.8 的解决方案：
1.8.7-p374 :001 > require 'date'
=> true
1.8.7-p374 :002 > DateTime.new(2012, 1, 15).strftime('%s')
=> "1326585600"
回答by wang sky
DateTime.new(2012, 1, 15).to_time.to_i
