Improve dateformat in javadocs about the meaning of 'm' and 'M'

A DESCRIPTION OF THE PROBLEM :
Right now there are lots of mentioning of 'yyyy-mm-dd' and other similar formats.
The problem is that in SimpleDateFormat and DateTimeFormatter small 'm' means minute of hours while big 'M' means the number of month. So the proposal is to fix dateformats in javadocs in appropriate way