isYesterday static method
是否是昨天
Implementation
static isYesterday({required int milliseconds}) {
DateTime now = DateTime.now(); //2021.8.24 获取今天的日期
DateTime yesterday = now.subtract(new Duration(days: 1));
return formatDate(yesterday, formats3) ==
formatDate(DateTime.fromMillisecondsSinceEpoch(milliseconds), formats3);
}