how many days january
âºâº How many days in January. There are 31 days in the month of January. âºâº Date difference from Jan 1, 2016 to Feb 1, 2016. The total number of days between Friday, January 1st, 2016 and Monday, February 1st, 2016 is 31 days. This is equal to 1 month. This does not include the end date, so it's accurate if you're measuring your age in days, or the total days between the start and end date.