Function getDatePeriod

getDatePeriod(start: Date, finish: Date): number
获取两个日期的间隔天数
Parameters
- start: Date
  起始日期
- finish: Date
  结束日期
Returns number
Since
0.0.1
Example
```
getDatePeriod(new Date('2021/03/28'), new Date('2021/03/29'))    // 1
```
- Defined in date.ts:15