partially fix date testsuite

testsuite/date/date-R-works

@@ -1,2 +1 @@
 test x"`date -R`" = x"`busybox date -R`"
-

testsuite/date/date-format-works

@@ -1 +1,4 @@
-test x"`date +%d/%m/%y`" = x"`busybox date +%d/%m/%y`"
+# TODO: gnu date doesn't accept '2000.11.22-11:22:33' format,
+# but accepts '2000-11-22 11:22:33'. We must follow.
+test x"01/01/99" = x"`busybox date -d 1999.01.01-11:22:33 '+%d/%m/%y'`"
+test x"22/11/00" = x"`busybox date -d 2000.11.22-11:22:33 '+%d/%m/%y'`"

testsuite/date/date-u-works

@@ -1,2 +1 @@
-test x"Wed Apr 23 11:22:33 UTC 2008" = x"`busybox date -u -d 11:22:33`"
-
+test x"Sat Jan  1 11:22:33 UTC 2000" = x"`TZ=CET-1CEST-2 busybox date -u -d 2000.01.01-11:22:33`"

testsuite/date/date-works

@@ -1,2 +1 @@
 test x"`date`" = x"`busybox date`"
-