如何从多个插槽中获取时间

Question

我正在尝试获取可用时段的时间。我的数据库中有 startDateTime、endDateTime、duration 和 bufferBetweenSlots 字段。通过一些计算，我计算出了可用插槽的数量。

字段的值为：

startDateTime: 8/20/2021 11:30 AM
endDateTime: 8/20/2021 9:30 PM
duration: 60
bufferBetweenSlots: 30

但我不确定如何获取可用时段的开始和结束时间。例如10:00 - 11:00

const getTimeDiffInMins = (endTime, startTime) =>
  (+new Date(endTime) - +new Date(startTime)) / (60 * 1000);

const getMultipleTimeSlots = (data) => {
  const diff = getTimeDiffInMins(data.end_date_time, data.start_date_time);
  const totalSlots = diff / data.duration;
  const totalBuffer = data.buffer_between_slots * totalSlots;
  const availableSlots = (diff - totalBuffer) / 60;

  return availableSlots;
};

有什么建议吗？

Answer 1

你应该只需要槽与槽之间的缓冲区，所以缓冲区的数量比槽的数量少一个，即你要解决：

n * slotTime + (n - 1) * bufferTime == totalTime

这样：

totalTime <= diff

您可以通过将缓冲区添加到 totalTime 并除以 slotTime + bufferTime，然后对结果进行取整以获得可用槽和缓冲区的总数。然后您可以迭代以产生所需的开始和结束时间。例如

let startDateTime = new Date(2021,7,8,11,30); // 20 Aug 2021 11:30
let endDateTime =  new Date(2021,7,8,22);  // 20 Aug 2021 22:00
let duration = 60; // minutes
let bufferBetweenSlots = 30; // minutes

let diff = (endDateTime - startDateTime) / 6e4; // minutes
let numberOfSlots = Math.floor((diff + bufferBetweenSlots) / (duration + bufferBetweenSlots)); // minutes

let slots = [];
let time = new Date(startDateTime);
for (let i = 0; i < numberOfSlots; i++) {
  // Add the slot start time
  slots[i] = {start: time.toString()};
  // Increment time to end of slot
  time.setMinutes(time.getMinutes() + duration);
  // Add the end time
  slots[i].end = time.toString();
  // Increment time to end of buffer
  time.setMinutes(time.getMinutes() + bufferBetweenSlots);
}

console.log(slots);

我将结束时间更改为 22:00 以显示它只放入完整的插槽。是否将时间戳或日期对象放入 slots 数组由您决定。请记住，如果添加日期，请像这样复制日期：

slots[i] = {start: new Date(+time)};
...
slots[i].end = new Date(+time);

Answer 2

感谢@RobG 花时间回答。这是我设法解决它的方法。

const getTimeDiffInMins = (endTime, startTime) =>
  (+new Date(endTime) - +new Date(startTime)) / (60 * 1000);

const convertToMilliSecs = (value) => value * 60 * 1000;

// coming from the db
const data = {
  duration: 60,
  buffer_between_slots: 30,
  start_date_time: '2021-08-20T10:30:00Z',
  end_date_time: '2021-08-20T20:30:00Z',
};

const {
  duration: a,
  buffer_between_slots: b,
  end_date_time: x,
  start_date_time: y,
} = data;

const duration = getTimeDiffInMins(x, y);
const slotDuration = a;
const totalSlots = a + b;

const numberOfSlots = Math.floor(duration / totalSlots);

const slotsAvailable = [...Array(numberOfSlots).keys()].map((slotNumber) => {
  const slotStart = (slotNumber - 1) * totalSlots;
  const slotEnd = slotStart + slotDuration;

  return {
    start: +new Date(y) + convertToMilliSecs(slotStart),
    end: +new Date(y) + convertToMilliSecs(slotEnd),
  };
});

/*
  Now we can format the time however we want
  I'm using momentjs:
  moment(new Date(slot.start)).format('h:mma')
*/
console.log(slotsAvailable);

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