Date Calculator Simple app for iPhone and iPad

1.Overview
This application calculates the duration from the start date and end date, and calculates the end date from the start date and duration.

2.How to use
- Calculate the duration
* After the start date and end date are entered, the duration is displayed with days, weeks, months, and years.
- Calculate the end date
* After the start date and duration are entered, the end date is displayed.
* The duration can be entered up to 99 years, 999 months, 9,999 weeks, and 99,999 days.
- If Duration is selected, the duration is calculated, and Date is selected, the end date calculated.
- The software keyboard can be closed by swiping the screen to left or right.