English
posted by rfvv .
Posted by rfvv on Saturday, September 25, 2010 at 9:16am.
1. Yesterday was his 100th day.
2. one hundredth day
3. a hundredth day
(How can we read '100th day'?)
English  Writeacher, Saturday, September 25, 2010 at 9:41am
Do you mean his 100th birthday? (Meaning he's 100 years old?)
Let me know.
English  Jen, Saturday, September 25, 2010 at 10:17am
and you can't say #3
======================
Thank you. Not 100 years old, but 100 days passed

I think rfvv is referring to the small celebration when an infant is 100 days old.
http://www.asianinfo.org/asianinfo/korea/cel/birthday_celebrations.htm 
You could say, "This is his hundredth day on the job."
You could say, "This is the one hundredth day since the mine caved in."
But "a hundredth day" wouldn't be used. 
Ah, I see.
So rfvv, how could you rephrase those sentences to reflect the 100th day celebration? 
I think he's using "100th day" as we would say "birthday." Yesterday was his birthday.
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