diff --git a/vmw_vm_uptime b/vmw_vm_uptime
index c89261c..8b30a1c 100755
--- a/vmw_vm_uptime
+++ b/vmw_vm_uptime
@@ -91,7 +91,7 @@ def main():
         uptimestr += f"{uptime // 3600:2}h"
         boottime = vm.runtime.bootTime
         if boottime:
-            boottime = boottime.strftime('%Y-%m-%d %H:%M')
+            boottime = boottime.strftime('%Y-%m-%d %H:%MZ')
         else:
             boottime = 'off'
             uptimestr = '-'