根据要减去的分钟数检查给定时间的上一时间间隔

function getPreviousTimeInterval(time, minutes) {
  var date = new Date(time);
  var year = date.getFullYear();
  var month = date.getMonth();
  var day = date.getDate();
  var hour = date.getHours();
  var minute = date.getMinutes();

  minute -= minutes;
  if (minute < 0) {
    minute += 60;
    hour--;
  }

  if (hour < 0) {
    hour += 24;
    day--;
    if (day < 1) {
      month--;
      if (month < 0) {
        month = 11;
        year--;
      }
      day = new Date(year, month + 1, 0).getDate();
    }
  }

  var previousTime = new Date(year, month, day, hour, minute);
  return previousTime;
}

// 示例用法
var currentTime = new Date(); // 获取当前时间
var previousTime = getPreviousTimeInterval(currentTime, 30); // 获取当前时间的上一时间间隔（减去30分钟）
console.log(previousTime);