If the timezone changes under my feet the unix timestamp might suddenly not refer to my birtday anymore.
Watching people struggle with this is frustrating.
Also I currently work with frontend and while it is no surprise that JavaScript has messed this up badly [0] it surprised me when I realised that a certain large UI framework had a) messed it up b) didn't realize it and tried to close it down when people tried to help.
[0]: they copied Javas first broken Date handling and suddenly they were stuck with it IIRC.
If the timezone changes under my feet the unix timestamp might suddenly not refer to my birtday anymore.
Watching people struggle with this is frustrating.
Also I currently work with frontend and while it is no surprise that JavaScript has messed this up badly [0] it surprised me when I realised that a certain large UI framework had a) messed it up b) didn't realize it and tried to close it down when people tried to help.
[0]: they copied Javas first broken Date handling and suddenly they were stuck with it IIRC.
Edit: heh, double-ninjaed