From 56da1f2aa7edb4e39c147c7ecf1788991ad67d85 Mon Sep 17 00:00:00 2001 From: Paul Eggert Date: Mon, 13 Sep 2021 00:09:59 -0700 Subject: [PROPOSED] Document background of rolling leap seconds * zic.8: Give background for rolling leap seconds, adapted from email by Arthur David Olson in: https://mm.icann.org/pipermail/tz/2021-September/030368.html --- zic.8 | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/zic.8 b/zic.8 index 3023ebe..592905e 100644 --- a/zic.8 +++ b/zic.8 @@ -709,9 +709,17 @@ or .q "Rolling" if the leap second time given by the other fields should be interpreted as local (wall clock) time. -(Rolling leap seconds are not supported if the +.PP +Rolling leap seconds were meant to accommodate older New York +Times Square ball drops where there'd be a +.q "3... 2... 1... leap... Happy New Year" +countdown, placing the leap second at +midnight New York time rather than midnight UTC. +This countdown style has fallen out of favor +and rolling leap seconds are not used in practice; +also, they are not supported if the .B \*-r -option is used.) +option is used. .PP The expiration line, if present, has the form: .nf -- 2.31.1