Combine date and time when date is a DateTime and time is a string

Question

I am working with an old mysql database in which a date is stored (without a time) as a datetime and a time is stored as a string (without a date).

In C# I then have a D

Answer 1

I am fairly sure you could combine and convert these values into a timestamp using SQL.

Answer 2

You can use TimeSpan.Parse to parse the time, and then add the result to the date:

DateTime newDateTime = oldDateTime.Add(TimeSpan.Parse(timeString));

Answer 3

I think you're worrying about the string conversion too much. By combining the 2 string elements together you are saving further date string parsing anyway which will most likely be more expensive.

Is this going to be repeated a lot of times or a simple step in a larger process?

Answer 4

I used something similar to what simendsjo says, except I continued to have it as a DateTime

DateTime date = Convert.ToDateTime(txtTrainDate.Text);
DateTime time = Convert.ToDateTime(ddTrainTime.SelectedValue);
DateTime dtCOMPLTDTTM = new DateTime(date.Year, date.Month, date.Day, time.Hour, time.Minute, time.Second);

Answer 5

var dt = new DateTime(2010, 06, 26); // time is zero by default
var tm = TimeSpan.Parse("01:16:50");
var fullDt = dt + tm; // 2010-06-26 01:16:50