how to pronounce years
1910: nineteen-tenth or nineteen- ten
1950:nineteen-fifties or nineteen-fifty
2012:twenty-twelve or two thousand twelve or two thousand twelfth

I am really confused. please explain what is the best way to pronounce years correctly

Question

how to pronounce years
1910: nineteen-tenth or nineteen- ten
1950:nineteen-fifties or nineteen-fifty
 2012:twenty-twelve or two thousand twelve or two thousand twelfth

I am really confused. please explain what is the best way to pronounce years correctly

Answer

nineteen-ten
nineteen-fifty
twenty-twelve or two-thousand-and-twelve (rare)

Answer

nineteen-ten
nineteen-fifty 1950s=nineteen-fifties
twenty-twelve or two thousand twelve

I think it just comes with experience with years and practice :)