diff -ru ChezScheme-9.5.2/c/stats.c /builds/richlowe/ChezScheme-9.5.2/c/stats.c
--- ChezScheme-9.5.2/c/stats.c	2019-03-21 22:05:24.000000000 +0000
+++ /builds/richlowe/ChezScheme-9.5.2/c/stats.c	2019-08-06 00:12:59.343648209 +0000
@@ -417,7 +417,11 @@
     }
   }
 #else
+# if defined(SOLARIS)
+  tzoff = tmxp->tm_isdst ? -altzone : -timezone;
+# else
   tzoff = tmxp->tm_gmtoff;
+# endif
   if (given_tzoff == Sfalse) {
 # if defined(__linux__) || defined(SOLARIS)
     /* Linux and Solaris set `tzname`: */