diff --git a/contrib/tzcode/stdtime/ctime.3 b/contrib/tzcode/stdtime/ctime.3
--- a/contrib/tzcode/stdtime/ctime.3
+++ b/contrib/tzcode/stdtime/ctime.3
@@ -30,7 +30,7 @@
 .\"     From: @(#)ctime.3	8.1 (Berkeley) 6/4/93
 .\" $FreeBSD$
 .\"
-.Dd March 4, 2022
+.Dd September 10, 2022
 .Dt CTIME 3
 .Os
 .Sh NAME
@@ -80,9 +80,7 @@
 and
 .Fn localtime
 all take as an argument a time value representing the time in seconds since
-the Epoch (00:00:00
-.Tn UTC ,
-January 1, 1970; see
+the Epoch (00:00:00 UTC , January 1, 1970; see
 .Xr time 3 ) .
 .Pp
 The function
@@ -112,9 +110,7 @@
 .Fa tm_isdst Ns 'th
 element of
 .Fa tzname
-to a pointer to an
-.Tn ASCII
-string that is the time zone abbreviation to be
+to a pointer to an ASCII string that is the time zone abbreviation to be
 used with
 .Fn localtime Ns 's
 return value.
@@ -183,8 +179,7 @@
 pointed to by tm into a time value with the same encoding as that of the
 values returned by the
 .Xr time 3
-function (that is, seconds from the Epoch,
-.Tn UTC ) .
+function (that is, seconds from the Epoch, UTC) .
 The
 .Fn mktime
 function
@@ -195,7 +190,7 @@
 .Fn timegm
 function
 interprets the input structure as representing Universal Coordinated Time
-.Pq Tn UTC .
+.Pq UTC .
 .Pp
 The original values of the
 .Fa tm_wday
@@ -286,10 +281,8 @@
 .Pp
 The field
 .Fa tm_gmtoff
-is the offset (in seconds) of the time represented from
-.Tn UTC ,
-with positive
-values indicating east of the Prime Meridian.
+is the offset (in seconds) of the time represented from UTC,
+with positive values indicating east of the Prime Meridian.
 .Sh SEE ALSO
 .Xr date 1 ,
 .Xr clock_gettime 2 ,
@@ -363,6 +356,12 @@
 .Fn localtime_r
 have been available since
 .Fx 8.0 .
+.Sh CAVEATS
+The
+.Fn localtime
+function returns a NULL pointer, if the passed in time translates to a year
+that will not fit in an integer type.
+It is stricly recommended to check the return value to avoid garage output.
 .Sh BUGS
 Except for
 .Fn difftime ,
@@ -376,13 +375,10 @@
 function will modify the same object.
 .Pp
 The C Standard provides no mechanism for a program to modify its current
-local timezone setting, and the
-.Tn POSIX Ns No \&-standard
+local timezone setting, and the POSIX-standard
 method is not reentrant.
 (However, thread-safe implementations are provided
-in the
-.Tn POSIX
-threaded environment.)
+in the POSIX threaded environment.)
 .Pp
 The
 .Va tm_zone