Access Date/Time
fields always store both a Date and a Time component. If only a Time value is specified then the Date part defaults to 1899-12-30.
If you want to display just the Time part in a DataGridView column you can set its format to "short time" using something like this (C#, but VB.NET would be very similar):
dataGridView1.Columns[3].DefaultCellStyle.Format = "t"; // short time