检查日期时间变量是今天、明天还是昨天

我不知道如何检查日期时间变量是今天、明天还是昨天。

我在类成员中没有找到方法。

final now = DateTime.now();
final today = DateTime(now.year, now.month, now.day);
final yesterday = DateTime(now.year, now.month, now.day - 1);
final tomorrow = DateTime(now.year, now.month, now.day + 1);


final dateToCheck = ...
final aDate = DateTime(dateToCheck.year, dateToCheck.month, dateToCheck.day);
if(aDate == today) {
  ...
} else if(aDate == yesterday) {
  ...
} else(aDate == tomorrow) {
  ...
}

Hit: now.day - 1 and now.day + 1适用于导致不同年份或月份的日期。