day01 template fix

Change-Id: I06fae9aeaab59332e777ea5a9cca3bf09a0674f4
diff --git a/Jenkinsfile b/Jenkinsfile
index a30d4f3..6769e0e 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -37,6 +37,8 @@
 
 // Load shared libs
 common = new com.mirantis.mk.Common()
+def date = new Date()
+def dateTime = date.format("ddMMyyyy-HHmmss")
 
 ArrayList extra_vars = EXTRA_VARIABLES.readLines()
 IMAGE_NAME = IMAGE_NAME + "-" + dateTime