Aaj kal aap aksar sunte hain Shamsi, Miladi, aur Hijri nizamoon ke baare mein. Kai logon ko nata hai in alag-alag tareeqon ko samajhna. Asl mein , yeh sab tareeqe duniya ke hisse mein zamaney time ke ansaar hain. Miladi tareeqa {goi ki | shabashme' | bas] saal ke roz ki sankhya par mabni hai aur Shamsi tareeqa suraj ke ghiraaron ke rakhne par dast