Check if a given date is past

I have a week calendar that holds events, and want that users can't add events for the past days. So I'm tring to use a function like that:

if( strtotime($this->day) < time() ){ // date format is YYYY-MM-DD
// date is past 
}else{   
// date is not past
}

It seems to works fine, except that it consider today date as a past day. What am i doing wrong?

php date time

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