[tbb-bugs] #15473 [Tor Browser]: JS Date object reveals OS type (TBB specific)

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#15473: JS Date object reveals OS type (TBB specific)
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     Reporter:  arthuredelstein  |      Owner:  tbb-team
         Type:  defect           |     Status:  new
     Priority:  normal           |  Milestone:
    Component:  Tor Browser      |    Version:
   Resolution:                   |   Keywords:  tbb-fingerprinting-os
Actual Points:                   |  Parent ID:
       Points:                   |
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Comment (by mcs):

 Replying to [comment:4 arthuredelstein]:
 > I just tested in standard Firefox (presumably using the US English
 locale) by entering:
 > `[new Date().toLocaleFormat(), new Date().toLocaleString()]`
 > ...

 I did not try toLocaleFormat() before but here is what I got using your
 same technique:

 Ubuntu:
 {{{Array [ "Thu 26 Mar 2015 03:43:35 PM EDT", "3/26/2015, 3:43:35 PM" ]}}}
 OSX:
 {{{Array [ "Thu Mar 26 15:38:55 2015", "3/26/2015, 3:38:55 PM" ]}}}
 Windows 7:
 {{{Array [ "Thursday, March 26, 2015 3:45:01 PM", "3/26/2015, 3:45:01 PM"
 ]}}}

 So it seems that toLocaleFormat() is a problem in any case.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/15473#comment:5>
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