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IMPORTANT, MUST BE READ... : A Nice Rant About Representing Computer System Time
Title : A Nice Rant About Representing Computer System Time

A Nice Rant About Representing Computer System Time

IMPORTANT, MUST BE READ... Here's a prissy rant most dealing alongside time, fourth dimension zones, daylight savings time, boundary seconds, together with why keeping things direct is together with then difficult. This specially applies to embedded systems which mightiness non receive got a network connection, permit solitary access to a networked fourth dimension service.

 The overall video serial looks pretty interesting too, although it's to a greater extent than most computers inwards full general than embedded computers specifically.  (Scroll downward past times the video link to run across a listing of how time-keeping bugs receive got caused severe outages together with fifty-fifty deaths.)

"Summary: Published on December 30, 2013 Influenza A virus subtype H5N1 spider web app that plant out how many seconds agone something happened. How hard tin coding that be? Tom Scott explains how fourth dimension twists together with turns similar a twisty-turny thing. It's non to live on trifled with! (Embedded from YouTube; <computerphile>)"




Bonus content: hither is a rogue's gallery of fourth dimension goofs that I go on to include inwards my classroom lectures.  If y'all know of other high profile outages or worse delight submit every bit comments together with I'll update the listing every bit nosotros go. (Note: this is exclusively bugs caused past times bad time-keeping, non all software outages):

• Feb. 1991: Patriot missile failure due to floating indicate fourth dimension roundoff; 28 deaths (link)
• Dec 31, 1999: Y2K
• Feb. 2007: F-22 raptor reckoner arrangement crash due to crossing the international appointment occupation (link)
• Feb. 2008: Microsoft Zunes basically bricked past times boundary yr põrnikas (link) 
• Mar. 2011:  iPhones fountain dorsum instead of springing frontward (link)
• Mar. 2012: Windows Azure leap-year põrnikas takes downward G-cloud (link)
• Jul. 1, 2015: Another boundary instant problem, only non nearly every bit bad every bit 2012 (link)
• Feb. 2016: iPhone prank bricks iPhones if appointment ready dorsum to null Unix fourth dimension (link)
• Feb. 2016: Leap yr põrnikas leaves passengers without bags at Dusseldorf airdrome (link)
• Jan. 19, 2038 03:15:07 GMT:  Unix fourth dimension rolls over ("Y2K for Unix")

(There are relatively few listings earlier 2010.  Don't intend for a infinitesimal that fourth dimension all of a abrupt got harder. What got worse was in all likelihood to a greater extent than things tin live on broken together with result inwards headlines due to timekeeping faults.)

Update 11/8/2016:  This is an entertaining together with enlightening post most the quirks of time:  Falsehoods programmers believe most time and it has a follow-up of additional falsehoods

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