Yes. Always for the current real-life month: you can play and replay any date again and again to improve your score.

However, once a real-life month ends you can play only its last seven days. In addition, those seven days are playable only once. That is, you cannot play them again if they have already been played. This rule applies only to the month that has just ended. Months further in the past cannot be played anymore.

Tip: try to replay and improve all your scores before a month ends