有没有办法在Javascript中将只有hh：mm的字符串转换为日期

我在mongoose模式中有一个代表日期的business hours对象.我正在传递一个json对象，并检索到要解析为字符串的对象.我想知道你是否可以，或者将它表示为另一种类型的对象是否更好.当我像这样传球时，我得到的错误是:validation failed: business.businessHours.monday.startTime: Cast to date failed for value "08:00" (type string)

一种解决方法是设置器，将当前日期与小时和分钟相加:

date.setHours(08);
date.setMinutes(30);

我觉得有更好的方法.

我的目标是:

{
  ...,
  "businessHours":{
            "monday": {
                "startTime": "08:00",
                "endTime": "18:30"
            },
            "tuesday": {
                "startTime": "08:00",
                "endTime": "18:30"
            },
            "wednesday": {
                "startTime": "08:00",
                "endTime": "18:30"
            },
            "thursday": {
                "startTime": "08:00",
                "endTime": "18:30"
            },
            "friday": {
                "startTime": "08:00",
                "endTime": "18:30"
            },
            "saturday": {
                "startTime": null,
                "endTime": null
            },
            "sunday": {
                "startTime": null,
                "endTime": null
            }
        }
}

模式如下所示:

const sellerSchema = new mongoose.Schema({
  user: {
    type: mongoose.Schema.Types.ObjectId,
    ref: "User",
    unique: true,
  },
  ...,
business: {
  businessHours: {
    monday: {
      startTime: {
        type: Date,
      },
      endTime: {
        type: Date,
      },
    },
    tuesday: {
      startTime: {
        type: Date,
      },
      endTime: {
        type: Date,
      },
    },
    wednesday: {
      startTime: {
        type: Date,
      },
      endTime: {
        type: Date,
      },
    },
    thursday: {
      startTime: {
        type: Date,
      },
      endTime: {
        type: Date,
      },
    },
    friday: {
      startTime: {
        type: Date,
      },
      endTime: {
        type: Date,
      },
    },
    saturday: {
      startTime: {
        type: Date,
      },
      endTime: {
        type: Date,
      },
    },
    sunday: {
      startTime: {
        type: Date,
      },
      endTime: {
        type: Date,
      },
    },
  },
}

我知道我可以在保存之前转换它，但是有没有办法解析一个到目前为止只有hh:mm的字符串？我似乎找不到一个方法，或者把它作为一个不同的对象来表达会更好，什么样的对象才是这个场合的理想对象.

或者我应该有一个这样的模式:

我需要时间和分钟来做future 的逻辑.

const sellerSchema = new mongoose.Schema({
  ...,
  business: {
    businessHours: {
      monday: {
        startTime: Number, //which will be represented as HHMM
        endTime: Number, //which will be represented as HHMM
      },
    },
  },
});

非常感谢.