Aaj kal aap aksar sunte hain Shamsi, Miladi, aur Hijri kalendaron ke baare mein. Zyaada logon ko mushkil lagta hai in sabhi tareeqon ko samajhna. Dar असल, yeh sab tareeqe duniya ke khule zamaney time ka hissa hain. Miladi tareeqa {goi ki | shabashme' | bas] saal ke din ki ginti par mabni hai