formatDateTimeline static method
2018-07-24 00_00_00 路径需要在天数和小时之间用下划线替换空格
Implementation
static String formatDateTimeline(DateTime dateTime, bool isPath) {
return formatDate(
dateTime, [yyyy, '-', mm, '-', dd, isPath? '_':' ', HH, '_', nn, '_', ss]);
}