We usually write the date in one of two ways:

I was born on 2nd October 1970.
I was born on October 2nd 1970.

We say these dates in this way:

I was born on the second of October nineteen seventy.
I was born on October the second nineteen seventy.

When we say the year we divide the number into two:

1990 – nineteen ninety
1278 – twelve seventy-eight

For the first 10 years of the millenium it is different:

2002 – two thousand and two
1009 – one thousand and nine

If we only say the month or the year without saying the exact date, the prepostion is in:

We got married in 2005.
They are going on holiday in July.

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