smart_month

https://github.com/perezd/smart_month

You can use SmartMonth to: - Determine the first tuesday of any month in any year. - Determine all of the fridays of any month in any year. - Iterate through all the days of a month. - Determine how many days of the month there are. - Determine the first and last days of the month. - And other fun date/month related things!