[feature] for better and easier reading convert weeks into month without some hours and minutes

[AngelTs]

2017-09-25 15:55:00 to 2017-08-25 17:12:00 is: 4 weeks, 1 day, 22 hours, 43 minutes and 51 seconds but should be much better if be: 1 month without 1 hour and 17 minutes (and 9 seconds) http://countdownjs.org/demo.html