║│                                                            │║
 ║│ • cat                                                      │║
 ║│ • cp                                                       │║
+║│ • date                                                     │║
 ║│ • echo                                                     │║
 ║│ • file                                                     │║
 ║│ • find                                                     │║
 ║│ • rm                                                       │║
 ║│ • sed                                                      │║
 ║│ • sleep                                                    │║
+║│ • stat                                                     │║
 ║│ • test                                                     │║
 ║│ • touch                                                    │║
 ║│ • tr (requires support for `-d´)                           │║
 # different implementation, you can override the appropriate variable.
 CAT := cat
 CP := cp
+DATE := date
 ECHO := echo
 FILE := file
 FIND := find
 RM := rm
 SED := sed
 SLEEP := sleep
+STAT := stat
 TEST := test
 TOUCH := touch
 TR := tr
 $(call compiled,$(compilablefiles)): $(BUILDDIR)/public/%: $$(call parsed,$(SRCDIR)/%) $(BUILDDIR)/transform.xslt $$(call parsed,$$(call dependencies,$(SRCDIR)/%))
        $(silent)$(call ensuredirectory,$(dir $@))
        @$(PRINTF) '%s\n' $(call quote,Compiling `$*´…)
-       $(silent)$(XSLTPROC) -o $(call quote,$@) --stringparam catalog 'catalog' $(call quote,$(BUILDDIR)/transform.xslt) $(call quote,$<)
+       $(silent)$(XSLTPROC) -o $(call quote,$@) --stringparam catalog 'catalog' --stringparam buildtime '$(shell TZ= $(DATE) '+%Y-%m-%dT%H:%M:%SZ')' --stringparam srctime '$(shell TZ= $(STAT) -f '%Sm' -t '%Y-%m-%dT%H:%M:%SZ' $(call quote,$(SRCDIR)/$*))' --stringparam path $(call quote,/$*) $(call quote,$(BUILDDIR)/transform.xslt) $(call quote,$<)
 $(call compiled,$(filter $(assetfiles),$(sourcefiles))): $(BUILDDIR)/public/%: $(SRCDIR)/%
        @$(PRINTF) '%s\n' $(call quote,Compiling `$*´…)
        $(silent)$(call ensuredirectory,$(dir $@))