Select Date from a Datetime value - linq-to-sql

Question

I want to select Date part from a DateTime value using Linq to Sql or sql lambda.
Here is my scenario.
dbContext.PurchaseOrders.Where(r => r.ReqDate == DateTime.Now).ToList();
Here ReqDate is a DateTime field. I want to select all the purchase orders for today.

Answer 1

It shouild be as simple as just using the Date property in DateTime:
UPDATE: From the 3rd error in the comments I see that ReqDate is A Nullable<DateTime>. Try using the Value property to access the underlying DateTime object:
dbContext.PurchaseOrders.Where(r => r.ReqDate.Value.Date == DateTime.Now.Date)
.ToList();
EDIT
Alternatively, you could try the not-so-pretty option:
dbContext.PurchaseOrders.Where(r => r.ReqDate.ToString("yyyy-MM-dd") ==
DateTime.Now.ToString("yyyy-MM-dd"))
.ToList();
Just convert your DateTime objects to a string formatted to contain the date only.

Answer 2

I have an answer that will return a list. Long way I know but I could not find a solution anywhere.
I hope this save someone else the frustration. I have been searching and searching to find an answer to this issue.
It does a group by on datetime to return a list of dates with no time. In my case it was to load a combo box of dates to choose from.
var mADates = from ta in db.AM_Assignments
orderby ta.Assignment_DTM
group ta by ta.Assignment_DTM.Date;
List<DateTime> dtx = new List<DateTime>();
foreach (var dt in mADates)
{
dtx.Add(Convert.ToDateTime(dt.Key.ToShortDateString()));
}
return dtx;

Answer 3

Use the Subtract method.
dbContext.PurchaseOrders.Where(r => DateTime.Now.Subtract(r.ReqDate).Days == 0).ToList();

Answer 4

try this:
dbContext.PurchaseOrders.Where(r => r.ReqDate.Date == DateTime.Today).ToList();

Answer 5

.Date creates a 00:00:00 time so time is not compared
dbContext.PurchaseOrders.Where(r => r.ReqDate.Date == DateTime.Now.Date).ToList();

Answer 6

There are some LINQ2SQL functions that imitate native SQL ones. One of them - truncation of time from DateTime? or DateTimeOffset?.
var today = DateTime.Now.Date;
dbContext.PurchaseOrders.Where(r => DbFunctions.TruncateTime(r.ReqDate).Value == today).ToList();

Answer 7

More compact version of #Angus 's code
var mADates = from ta in db.AM_Assignments
orderby ta.Assignment_DTM
group ta by ta.Assignment_DTM.Date;
return mADates.Select(dt => Convert.ToDateTime(dt.Key.ToShortDateString())).ToList();