[LEAPSECS] one second tolerance

Mark Calabretta mcalabre at atnf.csiro.au
Wed Feb 9 01:54:35 EST 2011

On Wed 2011/02/09 06:25:25 -0000, Ian Batten wrote
in a message to: Tom Van Baak <tvb at leapsecond.com>,
Leap Second Discussion List <leapsecs at leapsecond.com>

>Although that mandates access to a continuously reliable source of DST

>changeover dates and offsets. It also opens the interesting question

>of what timestamps mean in a non-monotonic timescale: during the autumn

>change, a hour is repeated. So as far as a clock ticking civil time is

>concerned, you have 0100 through 0200 twice, once a year. Events

>stamped 0130.01 and 0130.02 could be an hour and a second apart.

Not if the timestamps are properly labelled with the timezone,
preferably specified as an offset, which distinguishes between
DST and non-DST.

Mark Calabretta

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