format static method

String format(int millisecondsSinceEpoch, { bool dayOnly = true, })

millisecondsSinceEpoch:要格式化的日期；dayOnly:是只展示到天

Implementation

static String format(int millisecondsSinceEpoch, {bool dayOnly = true}) {
  //当前日期
  DateTime nowDate = DateTime.now();
  //传入的日期 millisecondsSinceEpoch
  DateTime targetDate =
      DateTime.fromMillisecondsSinceEpoch(millisecondsSinceEpoch);
  String prefix = "";

  // 不是当年
  if (nowDate.year != targetDate.year) {
    prefix = DateFormat("yyyy年M月d日").format(targetDate);
  } else if (nowDate.month != targetDate.month) {
    // 同一年非当月
    prefix = DateFormat("M月d日").format(targetDate);
  } else if (nowDate.day != targetDate.day) {
    // 当天
    if (nowDate.day - targetDate.day == 1) {
      prefix = '昨天';
    } else {
      // 非当天
      prefix = DateFormat("M月d日").format(targetDate);
    }
  }

  // 返回日期
  if (prefix.isNotEmpty && dayOnly) {
    return prefix;
  }

  int targetHour = targetDate.hour;
  String returnTime = "", suffix = DateFormat("h:mm").format(targetDate);

  // 时间
  if (targetHour >= 0 && targetHour < 6) {
    returnTime = '凌晨';
  } else if (targetHour >= 6 && targetHour < 8) {
    returnTime = '早晨';
  } else if (targetHour >= 8 && targetHour < 11) {
    returnTime = '上午';
  } else if (targetHour >= 11 && targetHour < 13) {
    returnTime = '中午';
  } else if (targetHour >= 13 && targetHour < 18) {
    returnTime = '下午';
  } else if (targetHour >= 18 && targetHour <= 23) {
    returnTime = '晚上';
  }
  return '$prefix $returnTime$suffix';
}