flutter时间戳转换【源码】

/*  时间戳转字符串
* timestamp 时间戳
* formart ："y-m":年和月之间的符号,
* "m-d":月和日之间的符号
* "h-m":时和分之间的符号,
* "m-s":分和秒之间的符号；
* "m-a":是否显示上午和下午
*/

class Utils {
  static String dateAndTimeToString(var timestamp,
      {Map<String, String> formart}) {
    if (timestamp == null || timestamp == "") {
      return "";
    }
    String targetString = "";
    final date = new DateTime.fromMicrosecondsSinceEpoch(timestamp * 1000);
    // final String tmp = date.toString();
    String year = date.year.toString();
    String month = date.month.toString();
    if (date.month <= 9) {
      month = "0" + month;
    }
    String day = date.day.toString();
    if (date.day <= 9) {
      day = "0" + day;
    }
    String hour = date.hour.toString();
    if (date.hour <= 9) {
      hour = "0" + hour;
    }
    String minute = date.minute.toString();
    if (date.minute <= 9) {
      minute = "0" + minute;
    }
    String second = date.second.toString();
    if (date.second <= 9) {
      second = "0" + second;
    }
    // String millisecond = date.millisecond.toString();
    String morningOrafternoon = "上午";
    if (date.hour >= 12) {
      morningOrafternoon = "下午";
    }

    if (formart["y-m"] != null && formart["m-d"] != null) {
      targetString = year + formart["y-m"] + month + formart["m-d"] + day;
    } else if (formart["y-m"] == null && formart["m-d"] != null) {
      targetString = month + formart["m-d"] + day;
    } else if (formart["y-m"] != null && formart["m-d"] == null) {
      targetString = year + formart["y-m"] + month;
    }

    targetString += " ";

    if (formart["m-a"] != null) {
      targetString += morningOrafternoon + " ";
    }

    if (formart["h-m"] != null && formart["m-s"] != null) {
      targetString += hour + formart["h-m"] + minute + formart["m-s"] + second;
    } else if (formart["h-m"] == null && formart["m-s"] != null) {
      targetString += minute + formart["m-s"] + second;
    } else if (formart["h-m"] != null && formart["m-s"] == null) {
      targetString += hour + formart["h-m"] + minute;
    }

    return targetString;
  }
}