[NTLUG:Discuss] Slightly OT: Why would I care about Leap Seconds

[Fred James]

All
Why would I care about Leap Seconds?  In the first paragraph at 
<http://cspry.co.uk/computing/Indy_admin/TIMEZONE.html> it says: 
"However, `TIMEZONE', as implemented in this way in IRIX, does not take 
into account leap seconds, nor changes made by the European Union and 
other bodies, in daylight savings time. The TIMEZONE settings have to be 
altered manually every year, to update them, as changeovers are often 
variable.**"  Do I care, and if so why?  No, I am not in the UK or 
Europe - I am in Texas.  Thank you in advance for any help you may be 
able to offer.
Regards
Fred James

PS:  I am using TZ=CST6CDT5,M3.2.0/2,M11.1.0/2 to deal with the new 
rules and so far testing has shown it to work on SGI IRIX 6.*, and on 
Unisys UNIX SVR4 release 2.  I shall be testing on some Linux boxes soon.