1. What I want to achieve is to select only the year and month rather than the specific number of days, I can do the format presentation, but how to select the calendar component when the default is the month, you can directly choose. 
 2. 
  
 1. What I want to achieve is to select only the year and month rather than the specific number of days, I can do the format presentation, but how to select the calendar component when the default is the month, you can directly choose. 
 2.