Aaj kal aap aksar sunte hain Shamsi, Miladi, aur Hijri nizamoon ke baare mein. Aksar logon ko lagta hai in alag-alag tareeqon ko samajhna. Asl mein , yeh tamam tareeqe duniya ke hisse mein ek ek time ke ansaar hain. Miladi tareeqa {goi ki | shabashme' | bas] saal ke dinon ki aded par mabni ha