Java中的SimpleDateFormat工作不正确还是我做错了？参见代码示例

Java中的SimpleDateFormat工作不正确还是我做错了？参见代码示例

至于文档https://docs.oracle.com/javase/7/docs/api/java/text/SimpleDateFormat.html
大写字母

D

代表a中的天数

year

，如果您想要a中的天数，

month

则应使用小写

d

。

同为

YYYY

和

yyyy

：

Letter  Date or Time Component  Presentation    ExamplesG   Era designator  Text    ADy   Year    Year    1996; 96Y   Week year   Year    2009; 09M   Month in year   Month   July; Jul; 07w   Week in year    Number  27W   Week in month   Number  2D   Day in year Number  189d   Day in month    Number  10F   Day of week in month    Number  2E   Day name in week    Text    Tuesday; Tueu   Day number of week (1 = Monday, ..., 7 = Sunday)    Number  1a   Am/pm marker    Text    PMH   Hour in day (0-23)  Number  0k   Hour in day (1-24)  Number  24K   Hour in am/pm (0-11)    Number  0h   Hour in am/pm (1-12)    Number  12m   Minute in hour  Number  30s   Second in minute    Number  55S   Millisecond Number  978z   Time zone   General time zone   Pacific Standard Time; PST; GMT-08:00Z   Time zone   RFC 822 time zone   -0800X   Time zone   ISO 8601 time zone  -08; -0800; -08:00