Ooops. Just remove CVS_CO_DATE_FLAGS from CVSCO_NSS if NSS_CO_TAG=NSS_CLIENT_TAG. Do not unset CVS_CO_DATE_FLAGS.

client.mk

@@ -217,9 +217,10 @@ ifdef NSS_CO_TAG
 endif
 # Cannot pull static tags by date
 ifeq ($(NSS_CO_TAG),NSS_CLIENT_TAG)
-CVS_CO_DATE_FLAGS :=
-endif
+CVSCO_NSS = $(CVS) $(CVS_FLAGS) co $(NSS_CO_FLAGS) $(NSS_CO_MODULE)
+else
 CVSCO_NSS = $(CVS) $(CVS_FLAGS) co $(NSS_CO_FLAGS) $(CVS_CO_DATE_FLAGS) $(NSS_CO_MODULE)
+endif
 
 ####################################
 # CVS defines for NSPR