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You use "on" + date to specify the day on which something happened.
You can also use "on" + a part of a day:
2. On the morning of January 17th, I broke my wrist.
3. On the evening of February 7th, I broke two ribs.
4. On the afternoon of March 20th, I broke three teeth.
Or even with a more general time-phrase:
5. On the following day, I threw away my lucky rabbit's foot.
Be careful, though, because there are some days where you can't use "on". These are:
today
yesterday
tomorrow
the day before yesterday
the day after tomorrow
the other day
X days ago
Although these all refer to specific days, you do not use any preposition with them.
Note also:
on Easter Sunday
on Christmas Day
on my birthday
These are all specific days. However:
at Easter
at Christmas
These don't refer to specific days. "At Easter" would include Good Friday, the following Saturday, Easter Sunday and Easter Monday, and possibly a few days before and after as well.
write the date 
Re: write the date 
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