add day mod to version number to cover arch complaining about downgrades

PKGBUILD

@@ -29,7 +29,8 @@ pkgver() {
   cd $(find "$srcdir" -maxdepth 1 -type d -name 'scst*')
 
   local ver="$(git rev-parse --short HEAD)"
-  printf "${_version}.%s" "${ver//[[:alpha:]]}"
+  local days=$(( ($(date --utc +%s) - $(date -d "2019-01-01 UTC" +%s)) / (60*60*24) ))
+  printf "${_version}.%s.%s" "${days}" "${ver//[[:alpha:]]}"
 }
 
 _base() {