Function addDay

Utilities for date

Author

David Hsing

addDay(date?: Date, amount?: number): undefined | Date
Returns the day calculated date with the source date and the specified amount
Parameters
- Optionaldate: Date
  The date to inspect
- Optionalamount: number
  The amount to add, negative number means minus
Returns undefined | Date
the day calculated date with the source date and the specified amount
Author
David Hsing
Example
```
addDay(new Date(2023, 8, 30), 1);    // Date(2023, 9, 1)
```