Question

I’m trying to check if a DateTime is already in my db.

I’ve broken up the code below in order to get a better understanding of what’s going on but despite my best efforts, dateChecks will always return an empty list.

    var MyDate = DateTime.Now;

    foreach (var milestone in mtMilestone.Milestones)
    {

        var checkIfAlreadyPulled = _ipdb.JsonDataReleases.
            Where(x => x.ReleaseId == mtMilestone.ReleaseId).ToList();

        var dateChecks = checkIfAlreadyPulled.
            Where(x => EntityFunctions.Equals(x.LastUpdated, MyDate)).ToList();

        if (!dateChecks.Any())
        {
            /* do stuff what this does it it makes a new entry into the JsonDataReleases 
            db using MyDate as the new LastUpdated value. */ 
        }

        /* Does more unrelated stuff... */

    }

EDIT: So I figured it out!

Turns out that when the DateTime.Now was being saved as the LastUpdated value in the sql db, it cuts off the milliseconds.

        var now = DateTime.Now;
        var MyDate= new DateTime(now.Year, now.Month, now.Day, now.Hour, now.Minute, now.Second);

Answer 1

If your LastUpdated field stores date & time, your Where clause will only select items with the same exact date & time of your MyDate. If you’re just comparing dates, you need to compare the .Date on each side:

var dateChecks = checkIfAlreadyPulled.
    Where(x => x.LastUpdated.Date == MyDate.Date).ToList();