Zameena mein aap aksar sunte hain Shamsi, Miladi, aur Hijri nizamoon ke baare mein. Aksar logon ko nata hai in alag-alag tareeqon ko samajhna. Asl mein , yeh sab tareeqe duniya ke vishkar zamaney time ki darja hain. Miladi tareeqa {goi ki | shabashme' | bas] saal ke roz ki ginti par mabni hai