just ask be forward
If you're asking them to be your valentine then you should ask on Valentines day but many people like to ask a week in advance! It all depends but dont ask to far in advance... things change so I'd say the best day is valentines day
Send them a valentine. Be nice to them, and when you think they like you, ask them out; it's not that hard really! I should know! ;)
The people celebrated it so it created. Ask no more, my god man/women. BEGONE
It is customary that you ASK someone to be your Valentine. (Usually on or about Valentine's Day.)
St. Valentine
Yes, it will only be Valentine's Day. However, if you are dating your valentine it will last longer then Valentine's Day.
Ask him
on valentines day, and give her something nice, like a rose^_^
There are traditions that a woman can ask a man to marry her in a leap year on St. Valentine's Day and on the 29th of February.
Give him a funny Valentine card to break the ice and see if that works.
man
You could call her, talk to her for a few minutes, and then ask her if she would like to the Valentine's Ball with you. You could also ask her in person.