Java format time string to date date turn string

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The date type is converted to string:

Date date = new Date ();
SimpleDateFormat SDF = new SimpleDateFormat ("Yyyy-mm-dd");
String Dbegin = Sdf.format (date);

The string type is converted to date:

String start= "2017-11-10";

SimpleDateFormat SDF = new SimpleDateFormat ("Yyyy-mm-dd");
Date Dbegin = Sdf.parse (start);

Used to be date, string, and then do the processing, today found an interesting phenomenon ...

And then I found out. The parse method turns the time wrong when it transforms the date ... Wrong 、、、、、 wrong 、、、、

Even more outrageous is .... Change the time format and then there's no problem .... This feeling,,,, acid cool AH!!!

Java format time string to date date turn string