Compare datatime field with current datetime in MySQL

I have something like that:

to_days(now()) < to_days(birth)

It work but instead of comp开发者_StackOverflowaring days I was to compare the time too. Is there a similar function?

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Why don't you just use:

birth > NOW()

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Are you looking for DAYOFYEAR() function ? http://dev.mysql.com/doc/refman/5.1/en/date-and-time-functions.html#function_dayofyear