compareTo 方法

int compareTo(
  1. DateTime other
)
override

比较此 DateTime 对象与 other,如果值相等则返回零。

compareTo 函数返回:

  • 如果此 DateTime isBefore other,则返回负值。
  • 如果此 DateTime isAtSameMomentAs other,则返回 0
  • 否则返回正值(当此 DateTime isAfter other 时)。
final now = DateTime.now();
final future = now.add(const Duration(days: 2));
final past = now.subtract(const Duration(days: 2));
final newDate = now.toUtc();

print(now.compareTo(future)); // -1
print(now.compareTo(past)); // 1
print(now.compareTo(newDate)); // 0

实现

external int compareTo(DateTime other);