[Rails] Request advice on best/usable field default

Hi all,
I am creating a bash.org-like. Basically: just store and retrieve quotes
that people enter. I would like the user to have the option of entering
a few fields, among which are a date a and location field.
What do you think is the best default to use for these fields? nil, or
today's date (or January 1st, year 1), or an empty string?
It may be possible later to search or sort using these fields, which is
why I am asking how you would do this. I may have not searched well, but
I didn't find anything on the web about this.

Thanks :)
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