flutter 时间格式转换

1.String-->DateTime:

DateTime.parse(String）;

2.DateTime -->formatString:

formatDate(DateTime ,[yyyy,'-',mm,'-',dd]);

formatDate源码：

https://github.com/tejainece/date_format/blob/master/lib/src/date_format_base.dart

用法：

https://github.com/tejainece/date_format/blob/master/example/date_format_example.dart

参考：

https://github.com/tejainece/date_format