How to get time-left for vpn user

I am using Mikrotik 5.22.
I am creating a web application for my users using Mikrotik API (for ASP.NET).
My Question:
How can i get the following fields for a user in (/tool user-manager):
Start time, End time, Time left

Please be aware that the web interface of user-manager show above field even if you cleared all session and log records but i cannot see these fields in (/tool user-manager user) or other section when i using API or writing command in console.

Please help. I am in hurry.