1.4. If only the third digit is zero, there are two ways of writing the year out:
1609 = the year sixteen oh nine, in American English;
1609 = the year sixteen hundred and nine, in British English;
1902 = the year nineteen oh two, in American English;
1902 = the year nineteen hundred and two, in British English;
2108 = the year twenty-one oh eight, in American English;
2108 = the year twenty-one hundred and eight, in British English;
1.5. In general, when the first three digits of the year are different of zero, we write the first two and the second two digits as if they were single numbers:
1870 = the year eighteen seventy, in both American and British English words;
1878 = the year eighteen seventy-eight, in both American and British English words;
1970 = the year nineteen seventy, in both American and British English words;
1973 = the year nineteen seventy-three, in both American and British English words;
2110 = the year twenty-one ten, in both American and British English words;
2115 = the year twenty-one fifteen, in both American and British English words;
1.6. For years before 1000, we often say the first digit separately, then the last two as a single number, taking into account all the rules that were listed above:
474 = the year four seventy-four, in both American and British English words;
474 = the year four hundred and seventy-four, in British English words;
906 = the year nine oh six, in both American and British English words;
906 = the year nine hundred and six, in British English words;
43 = the year forty-three, in both American and British English words;
17 = the year seventeen, in both American and British English words;