Hi smitha,
Thanks for your interest in Syncfusion products.
To set 24-hours date time format, please make use of the following code.
this.gridControl1.ColStyles[this.gridControl1.ColCount].CellValueType = typeof(DateTime);
this.gridControl1.ColStyles[this.gridControl1.ColCount].CellValue = DateTime.Now;
this.gridControl1.ColStyles[this.gridControl1.ColCount].Format = "HH:mm:ss:ff";
Please refer to the sample in the following link
http://www.syncfusion.com/downloads/Support/DirectTrac/92112/WindowsFormsApplication8519649990.zipPlease let me know if you have any concerns.
Regards,
Mercy.C