Twentieth.
"today"
it's today
Twentyth January two thousand and twelve
20th 30th
Today
If that was the date were currently, the answer would be "today".
forty
Twentieth.
10,000
You need to Spell out the number.
Yesterday
The ordinal number 19th is written as "nineteenth." It is used to indicate the position of something in a sequential order, coming after the 18th and before the 20th.