What is the format of yyyy-mm-dd?

[yyyy-mm-dd] is the date format, which means [year-month-day]. Sometimes it is written [yyyy-MM-dd] to distinguish [HH:mm:ss] [hour: Minutes:seconds] in mm minutes.

##yyyy-mm-dd is the date format, indicating year-month-day. Sometimes it is written as yyyy-MM-dd, which is In order to distinguish mm (minutes) in HH:mm:ss (hour:minute:second).

Usage example:

Date result1 = string2Date("2016-12-15", "yyyy-MM-dd");
System.out.println(result1);
Date result2 = string2Date("2016-12-15", "YYYY-MM-DD");
System.out.println(result2);
 
Date date1 = new Date();
System.out.println(date2String(date1, "yyyy-MM-dd"));
System.out.println(date2String(date1, "YYYY-MM-DD"));

Output result:

Thu Dec 15 00:00:00 CST 2016
Sun Dec 27 00:00:00 CST 2015
2016-12-20
2016-12-355

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