Even if you used roman numerals, it would still require more than 5 letters.
It is: TODAY
A date or Today
To write 24 January 2014 in 5 letters without using numbers kindly write 24.1.14.
today
Today
Today
Easter
It is: TODAY
A date or Today
Today (considering you'll read this answer today).
If you write April 26, 2011, this contains only 5 letters, but unfortunately also contains numbers...
To write 24 January 2014 in 5 letters without using numbers kindly write 24.1.14.
The only way that's possible is on that day, you can write "today". You missed it.
AUXXV
I-IX-MMXII
piyusha
A date