Hi Dennis,
Thank you for using Syncfusion products.
For setting the Time format in MS Excel we need to set the Time Custom format. XlsIO also follows the same and please use the following code snippet to set the Number format for Setting the Time value.
Code Snippet[C#]:
sheet.Range["D2:D4"].NumberFormat = "h:mm:ss"; //OR "h:mm:ss AM/PM" to display with AM & PM
sheet.Range["D5:D6"].NumberFormat = "h:mm:ss AM/PM";
We have also attached the sample with this mail for your reference. Please try teh attached sample and let us know if this helps you.
Please let me know if you require any further clarifications.
Thanks,
Sridhar.S
ImportDataTable_4634c5e3.zip