jm + calendar   4

Falsehoods programmers believe about time
I have repeatedly been confounded to discover just how many mistakes in both test and application code stem from misunderstandings or misconceptions about time. By this I mean both the interesting way in which computers handle time, and the fundamental gotchas inherent in how we humans have constructed our calendar — daylight savings being just the tip of the iceberg.

In fact I have seen so many of these misconceptions crop up in other people’s (and my own) programs that I thought it would be worthwhile to collect a list of the more common problems here.


See also the follow-up: http://infiniteundo.com/post/25509354022/more-falsehoods-programmers-believe-about-time-wisdom

(via Marc)
via:marcomorain  time  dates  timezones  coding  gotchas  calendar  bugs 
october 2014 by jm
Calendar Hacks
Some great tips on managing a busy calendar, from Etsy's managers. Block out time; refuse double-booked meetings by default; rely on apps; office hours. Thankfully I have a pretty slim calendar these days, but bookmarking for future use...
calendar  etsy  via:kellan  google  google-calendar  office-hours  life-hacks  hacks  tips  managing  managers  scheduling 
july 2014 by jm
Daylight saving time linked to heart attacks, study finds
Switching over to daylight saving time, and losing one hour of sleep, raised the risk of having a heart attack the following Monday by 25 per cent, compared to other Mondays during the year, according to a new US study released today. [...] The study found that heart attack risk fell 21 per cent later in the year, on the Tuesday after the clock was returned to standard time, and people got an extra hour’s sleep.

One clear answer: we need 25-hour days.

More details: http://www.sciencedaily.com/releases/2014/03/140329175108.htm --
Researchers used Michigan's BMC2 database, which collects data from all non-federal hospitals across the state, to identify admissions for heart attacks requiring percutaneous coronary intervention from Jan. 1, 2010 through Sept. 15, 2013. A total of 42,060 hospital admissions occurring over 1,354 days were included in the analysis. Total daily admissions were adjusted for seasonal and weekday variation, as the rate of heart attacks peaks in the winter and is lowest in the summer and is also greater on Mondays and lower over the weekend. The hospitals included in this study admit an average of 32 patients having a heart attack on any given Monday. But on the Monday immediately after springing ahead there were on average an additional eight heart attacks. There was no difference in the total weekly number of percutaneous coronary interventions performed for either the fall or spring time changes compared to the weeks before and after the time change.
daylight  dst  daylight-savings  time  dates  calendar  science  health  heart-attacks  michigan  hospitals  statistics 
march 2014 by jm
MS Exchange Data Provider for Lightning
Thunderbird's calendar can now integrate properly with MS Exchange 2007 and above via OWA.  (via adulau)
calendar  extension  microsoft  exchange  from delicious
december 2010 by jm

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