diff --git a/build.bash b/build.bash
index abadc33..12ceb91 100755
--- a/build.bash
+++ b/build.bash
@@ -148,11 +148,34 @@ function gitTag() {
 	echo ${tag}
 }
 
+function gitTagDate() {
+	local tag_name=${1}
+	local expr_path gopath gopkg mod
+	local tag_date
+
+	expr_path=$(exprPath)
+	if [[ "${expr_path}" ]]; then
+		tag_date=$(git -C "${expr_path}" show --no-patch --format=%ci "${tag_name}")
+	else
+		tag_date="n/a"
+		# gopath=$(go env GOPATH)
+		# gopkg="${gopath}/pkg/mod/git.portale-stac.it/go-pkg"
+		# if cd "${gopkg}" 2>/dev/null; then
+		# 	mod=$(ls -1v |grep expr@|tail -1)
+		# 	tag=${mod##*@}
+		# 	cd - >/dev/null
+		# fi
+	fi
+	echo ${tag_date}
+}
+
 function createVersionSource() {
-	local tag
+	local tag tag_date
 	tag=$(gitTag)
 	if [ -z "${tag}" ]; then
 		tag="n/a"
+	else
+		tag_date=$(gitTagDate "${tag}")
 	fi
 
 	cat >version.go <<eot
@@ -166,6 +189,7 @@ const (
 	PROGNAME     = "${PROGRAM_NAME}"
 	VERSION      = "v${PROGRAM_VERSION}(build $(getBuildCount)),$(date +"%Y/%m/%d") (celestino.amoroso@portale-stac.it)"
 	EXPR_VERSION = "${tag}"
+	EXPR_DATE    = "${tag_date}"
 )
 eot
 }