datetime - 检查datetime变量是今天，明天还是昨天

Question

我不知道如何检查datetime变量是今天，明天还是昨天。

我没有在类成员中找到方法。

Answer 1

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) {
  ...
}

匹配: now.day - 1和 now.day + 1在日期不同的年份或月份时效果很好。