【微信小程序】日期格式化

const formatTime = date => {
  const year = date.getFullYear()
  const month = date.getMonth() + 1
  const day = date.getDate()
  const hour = date.getHours()
  const minute = date.getMinutes()
  const second = date.getSeconds()

  return [year, month, day].map(formatNumber).join('-') + ' ' + [hour, minute, second].map(formatNumber).join(':')
}

const formatNewTime = n => {
  const date = new Date()
  const year = date.getFullYear()
  const month = date.getMonth() + 1
  const day = date.getDate()
  const hour = date.getHours()
  const minute = date.getMinutes()
  const second = date.getSeconds()

  return [year, month, day].map(formatNumber).join(n) + ' ' + [hour, minute, second].map(formatNumber).join(':')
}

const formatDate = date => {
  const year = date.getFullYear()
  const month = date.getMonth() + 1
  const day = date.getDate()

  return year + '年' + month + '月' + day + '日';
}

const format_Date = date => {
  const year = date.getFullYear()
  const month = date.getMonth() + 1
  const day = date.getDate()

  return [year, month, day].map(formatNumber).join('-')
}

const formatNumber = n => {
  n = n.toString()
  return n[1] ? n : '0' + n
}

const filePath = date => {
  const year = date.getFullYear()
  const month = date.getMonth() + 1
  const day = date.getDate()
  const hour = date.getHours()
  const minute = date.getMinutes()
  const second = date.getSeconds()
  const openId = wx.getStorageSync('openId')

  return 'uploadImg/' + [year, month, day].map(formatNumber).join('/') + '/' + openId + '-' + [year, month, day, hour, minute, second].map(formatNumber).join('')
}

var regYear = getRegExp("(y+)", "i");
 
var dateFormat = function(timestamp,format){
  if (!format) {
    format = "yyyy-MM-dd hh:mm:ss";
  }
  timestamp = parseInt(timestamp);
  var realDate = getDate(timestamp);
  function timeFormat(num) {
    return num < 10 ? '0' + num : num;
  }
  var date = [
    ["M+", timeFormat(realDate.getMonth() + 1)],
    ["d+", timeFormat(realDate.getDate())],
    ["h+", timeFormat(realDate.getHours())],
    ["m+", timeFormat(realDate.getMinutes())],
    ["s+", timeFormat(realDate.getSeconds())],
    ["q+", Math.floor((realDate.getMonth() + 3) / 3)],
    ["S+", realDate.getMilliseconds()],
  ];
  var reg1 = regYear.exec(format);
  // console.log(reg1[0]);
  if (reg1) {
    
    format = format.replace(reg1[1], (realDate.getFullYear() + '').substring(4 - reg1[1].length));
  }
  for (var i=0;i<date.length;i++) {
    var k = date[i][0];
    var v = date[i][1];
 
    var reg2 = getRegExp("(" + k + ")").exec(format);
    if (reg2) {
      format = format.replace(reg2[1], reg2[1].length == 1
        ? v : ("00" + v).substring(("" + v).length));
    }
  }
  return format;
}

module.exports = {
  formatTime,
  formatNewTime,
  formatDate,
  formatTimeNew,
  formatNumber,
  filePath,
  dateFormat
}

// 调用函数时，传入new Date()参数，返回值是日期和时间

var time = util.formatTime(new Date());

供参考！