Javascript get first day of the month

- Javascript get first day of month from date
- Javascript get first day of current month
- Javascript get first day of next month
- Javascript get first day of last month
- Javascript get first day of previous month
- Javascript moment get first day of month
- Javascript first day of the month
- Javascript get first and last day of current month
- Javascript date get first day of current month
- Javascript get first and last day of previous month
- 1 year of javascript