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-rw-r--r--doc/misc/calc.texi3
1 files changed, 2 insertions, 1 deletions
diff --git a/doc/misc/calc.texi b/doc/misc/calc.texi
index 89a340e7343..ef9990c057a 100644
--- a/doc/misc/calc.texi
+++ b/doc/misc/calc.texi
@@ -11040,7 +11040,8 @@ the year even for older dates. The customizable variable
have Calc's date forms switch from the Julian to Gregorian calendar at
any specified date.
-Today's timekeepers introduce an occasional ``leap second''.
+A few platforms support leap seconds, such as the time stamp
+1972-06-30 23:59:60 UTC, an extra second appended to June 1972.
These do not occur regularly and Calc does not take these minor
effects into account. (If it did, it would have to report a
non-integer number of days between, say,