Step 1:Transfer the import file from your computer to your iPhone in iTunes.
1. Connect your iphone to your computer via the Dock Connector USB cable.
2. Launch iTunes and go to the Apps tab for your iPhone. Scroll down to the File Sharing section at the bottom of the window.
3. From the left column of the File Sharing section, select ExcelCalendar app.
4. Click the Add… button, locate the file you want to transfer and click Choose.
Step 2: Launch ExcelCalendar app and tap the Import button.
Step 3: Select the "USB" import button.
Step 4: Select a file for importing in the File Sharing list.
Step 5: Choose "Load", all events in the excel will be loaded and display on the screen.
Step 6: tap "Import" and wait till the app finish import.