Function isSameDay

isSameDay(date?, comparison?, deepCompare?): boolean
Returns whether the given date is same day with the comparison date
Parameters
- Optionaldate: Date
  the date to check
- Optionalcomparison: Date
  the date to compare
- deepCompare: boolean = true
  whether compare deeply with year
Returns boolean
whether the given date is same day with the comparison date
Example
```
isSameDay(new Date(), new Date());    // true
```