fromMicrosecondsSinceEpoch method
微秒时间戳转换 DateTime
Implementation
DateTime? fromMicrosecondsSinceEpoch({bool isUtc = false}) {
num n = this;
if (n is! int) n = n.toInt();
if (n.toString().length != 16) return null;
return DateTime.fromMicrosecondsSinceEpoch(n, isUtc: isUtc);
}