diff -urNad viridian.orig/viridian-1.2/debian/rules viridian/viridian-1.2/debian/rules
--- viridian.orig/viridian-1.2/debian/rules	2015-02-22 10:20:43.648960717 +0000
+++ viridian/viridian-1.2/debian/rules	2015-02-22 10:21:41.527648408 +0000
@@ -11,6 +11,7 @@
 	convert $(CURDIR)/ViridianApp.png -resize 32 \
 			$(DESTDIR)/usr/share/pixmaps/ViridianApp.xpm; \
 	convert $(CURDIR)/ViridianApp.png -resize 48 \
+			+set date:create +set date:modify -define png:exclude-chunk=time \
 			$(DESTDIR)/usr/share/icons/hicolor/48x48/apps/ViridianApp.png; \
 
 override_dh_install: