Problems with Time

Another one for you folks.  Can anyone tell me what is going on here?


360.upto(370) do |d|
  time = Time.now
  t = time - (d * 60 * 60 * 24)
  puts "%s: %s | %s" % [t, time - t, Time.now - t]
end


Output:

2018-04-29 14:53:06 +0100: 31104000.0 | 31104000.00043
2018-04-28 14:53:06 +0100: 31190400.0 | 31190400.000098
2018-04-27 14:53:06 +0100: 31276800.0 | 31276800.000087
2018-04-26 14:53:06 +0100: 31363200.0 | 31363200.000066
2018-04-25 14:53:06 +0100: 31449600.0 | 31449600.000183
2018-04-24 14:53:06 +0100: 31536000.0 | 31536000.000071
2018-04-23 14:53:06 +0100: 31622400.0 | 31622400.000084
2018-04-22 14:53:06 +0100: 31708800.0 | 31708800.000066
2018-04-21 14:53:06 +0100: 31795200.0 | 31795200.000064
2018-04-20 14:53:06 +0100: 31881600.0 | 31881600.000088
2018-04-19 14:53:06 +0100: 31968000.0 | 31968000.000065


I'd expect `time - t` to be slightly different from `Time.now - t`, of course, but why does it appear to have different precision?  `Time.now`, `time` and `time - t` are all of class Time, so there's nothing funny there?


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