In case you forget it in the future, first backup and record these sample codes:

DateTime testDateTime = new DateTime(2022, 12, 10, 10, 50, 30);
testDateTime.Dump(\""Test" Date Time (DateTime)\");

TimeOnly testTimeOnly = TimeOnly. Parse(\"10:00 PM\");
testTimeOnly.Dump(\""Test" time (TimeOnly)\");

DateOnly testDateOnly = new DateOnly(2022, 11, 11);
testDateOnly.Dump(\""Date for testing"(DateOnly)\");

// ------------------------------------------------ --------------------------

DateOnly dateOnly = DateOnly.FromDateTime(testDateTime);
testDateOnly.ToString().Dump(\"Convert DateTime to DateOnly type\");

TimeOnly timeOnly = TimeOnly.FromDateTime(testDateTime);
timeOnly.ToLongTimeString().Dump(\"Convert DateTime to TimeOnly type\");

DateTime testDateTime2 = testDateOnly.ToDateTime(TimeOnly.Parse(\"10:00 PM\"));
testDateTime.Dump(\"Convert DateOnly to DateTime type\");

TimeSpan timeSpan = testTimeOnly. ToTimeSpan();
timeSpan.Dump(\"Convert TimeOnly to TimeSpan type (there should be no such use case or situation)\");

DateTime dt = DateTime.MinValue.AddSeconds(testTimeOnly.ToTimeSpan().TotalSeconds);
dt.Dump(\"Convert TimeOnly to DateTime type (there should be no such use case or situation)\");