Issue #8173 has been reported by hasari (Hiro Asari).

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Bug #8173: 2-arg form of Time.at can take a Time as either argument
https://bugs.ruby-lang.org/issues/8173

Author: hasari (Hiro Asari)
Status: Open
Priority: Normal
Assignee: 
Category: 
Target version: 
ruby -v: ruby 2.1.0dev (2013-03-11 trunk 39724) [x86_64-darwin12.2.1]


http://www.ruby-doc.org/core-2.0/Time.html#method-c-at shows 3 forms of invocation:

at(time) ??? time click to toggle source
at(seconds_with_frac) ??? time
at(seconds, microseconds_with_frac) ??? time

But the last form can take a Time as either argument (and converts to a numeric value represented by the number of seconds since the Epoch). If a Time is used as the second argument, the numeric value is then converted to microseconds to return a Time. (I hope that I'm making sense.)

irb(main):001:0> RUBY_DESCRIPTION
=> "ruby 2.1.0dev (2013-03-11 trunk 39724) [x86_64-darwin12.2.1]"
irb(main):002:0> t1=Time.at(10)
=> 1969-12-31 19:00:10 -0500
irb(main):003:0> t2=Time.at(t1,t1)
=> 1969-12-31 19:00:10 -0500
irb(main):004:0> t2.usec
=> 10

Is this intended behavior? If so, the documentation should be updated.

1.9.3 behaves the same way.


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