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-rw-r--r--lib/libc/stdtime/ctime.313
1 files changed, 12 insertions, 1 deletions
diff --git a/lib/libc/stdtime/ctime.3 b/lib/libc/stdtime/ctime.3
index 989db25..94f0622 100644
--- a/lib/libc/stdtime/ctime.3
+++ b/lib/libc/stdtime/ctime.3
@@ -196,7 +196,18 @@ The original values of the
and
.Fa tm_yday
components of the structure are ignored, and the original values of the
-other components are not restricted to their normal ranges.
+other components are not restricted to their normal ranges, and will be
+normalized if needed.
+For example,
+October 40 is changed into November 9,
+a
+.Fa tm_hour
+of \-1 means 1 hour before midnight,
+.Fa tm_mday
+of 0 means the day preceding the current month, and
+.Fa tm_mon
+of \-2 means 2 months before January of
+.Fa tm_year .
(A positive or zero value for
.Fa tm_isdst
causes
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