[time-nuts] The Problem with Time & Timezones - Computerphile

[Mark Sims]

Ahh,  but with Lady Heather you can specify the time zone offset (down to the second) and the when the daylight savings time switchovers occur.   And from experience,  I can tell you that the code to do it is a royal pain in the ass...  not all that hard to do,  but a pain to test.
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That is the problem.  Even if someone gives you this code free and it
works, then some years from now some country will change the date when they
switch over to daylight savings or they even change a time zone offset.