如何轉換FILETIME到Ruby時間，反之亦然

Question

MSDN FILETIME定義爲表示自1601年1月1，（UTC）的100毫微秒的時間間隔 數

64位的值。

如何轉換FILETIME和Ruby Time？

Answer 1

class Time 
    # Convert the time to the FILETIME format, a 64-bit value representing the 
    # number of 100-nanosecond intervals since January 1, 1601 (UTC). 
    def wtime 
    self.to_i * 10000000 + (self.tv_nsec/100.0).round + 116444736000000000 
    end 

    # Create a time object from the FILETIME format, a 64-bit value representing 
    # the number of 100-nanosecond intervals since January 1, 1601 (UTC). 
    def self.from_wtime(wtime) 
    Time.at((wtime - 116444736000000000)/10000000, 
      ((wtime - 116444736000000000) % 10000000)/10.0) 
    end 
end 

來源：Christopher Sexton，與我修復納秒/ 100的精度。

用法：基於您的代碼

wtime = 131172192735329876 
#=> 131172192735329876 

t = Time.from_wtime(wtime) 
#=> 2016-09-01 12:01:13 -0400 

t.wtime 
#=> 131172192735329876 

t.wtime == wtime 
#=> true 

Time.now.wtime 
#=> 131520319622603520 

Answer 2

，但略短：

require 'time' 

class Time 
    def self.from_wtime(wtime) 
    Time.utc(1601) + wtime.quo(10_000_000) 
    end 

    def wtime 
    ((to_r - Time.utc(1601).to_r) * 10_000_000).to_i 
    end 
end