abuild: print build start, end date and elapsed time

abuild.in

@@ -1519,11 +1519,15 @@ build_abuildrepo() {
 		# check early if we have abuild key
 		abuild-sign --installed
 		logcmd "building $repo/$pkgname-$pkgver-r$pkgrel"
-		msg "Building $repo/$pkgname $pkgver-r$pkgrel (using $program $program_version)"
+		local _starttime=$(date --utc +%s)
+		msg "Building $repo/$pkgname $pkgver-r$pkgrel (using $program $program_version) started $(date -R)"
 		for part in sanitycheck builddeps clean fetch unpack prepare mkusers build \
 				$_check rootpkg; do
 			runpart $part
 		done
+		local _endtime=$(date --utc +%s)
+		local _difftime=$((_endtime - _starttime))
+		msg "Build complete at $(date -R) elaped time $((_difftime/3600))h $((_difftime/60%60))m $((_difftime%60))s"
 		cleanup $CLEANUP
 	fi
 	update_abuildrepo_index