Aaj kal aap aksar sunte hain Shamsi, Miladi, aur Hijri kalendaron ke baare mein. Zyaada logon ko mushkil lagta hai in tamam tareeqon ko samajhna. Asl mein , yeh har tareeqe duniya ke khule zamaney time ki darja hain. Miladi tareeqa {goi ki | shabashme' | bas] saal ke roz ki sankhya par mabni hai aur Shamsi tareeqa suraj ke ghiraaron ke rakhne par