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A comment on Keeping Time with Amazon Time Sync Service. Parent comment

Re:Keeping Time with Amazon Time Sync Service by zaxomi on Wednesday November 29, 2017 @11:54PM (#15813571)
Or shorter... Leap seconds can be negative.
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Re:Keeping Time with Amazon Time Sync Service by duskwuff on Thursday November 30, 2017 @12:20AM (#15813660)
Theoretically, yes, but it's never happened since leap seconds were established in 1972, and it seems very unlikely to happen for quite some time. Chances are that a lot of software doesn't actually support negative leap seconds at all.
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