> Leap seconds become important when you start reaching back in the time. If
> you reach past the most recent leap second insertion point, the wall clock
> or TOD clock conversations start being off by one second per insertion.
> For many things, that's close enough.  For others (e.g. financial
> institutions) the time standards are established by regulatory agencies.

Also important if your authentication protocols include a time nonce (eg, 
Kerberos/AD). In some instances, a time variance of one second is enough to 
cause decryption of tickets. 

YMMV, but you may need to consider such things. 

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