On: Look Before You Leap – The Coming Leap Second and ...

[lambda]

  Leaving this message in place as an example of how  
  thinking about time and calendar-related programming is 
  easy to mess up.
		

Indeed, time and calendar related programming is quite tricky, even specifying what the behavior should be can be tricky and very non-intuitive.

[drumdance → lambda]

Dealing with time zone issues in code has driven me batty more than a few times.