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