date/time or date and time

I am setting up an SQL database and I will need to get differences in dates. For example I have a start date, start time, completion date and completion time and I want to get the difference between the start and completion.

Would it be better to have one field with both date and time in it, or better to have a date field and a time field?
Even though I have already started setting up the tables with seperate fields for date and time I am now leaning toward one field with date/time in it. (Only because that is the way I had to do it when setting up an Excel spreadsheet for a similar task)
When that is decided could someone please point me to a good resource for explaining to me the iConvertible method. I tried a simple page to insert a record into the database and got an error method telling me I had to use the iConvertible method. (I am programming in C#). I use a textbox on a webform to input the date and time information and the SQL database fields are set up as date/time. I looked at the visual studio documentation but that doesn't help me much. It doesn't show me the syntax required and how to "use" the method.
2/20/2004 1:50:51 AM 29906 articles. 0 followers. Follow

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one field with datetime should be good...easier for maintenance too..and it will solve your puspose too...

** no idea abt iConvertible...sorry
Dinakar Nethi
Life is short. Enjoy it.
2/20/2004 2:38:20 AM
You can use DataType as DateTime and to get the difference between the Dates you can use the DateTime.Subtract()
Sushila Bowalekar Patel
2/20/2004 2:51:37 AM

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