How to compare only Date without Time in DateTime types in Linq to SQL with Entity Framework

Question

Is there a way to compare two DateTime variables in Linq2Sql but to disregard the Time part   The app stores items in the DB and adds a published date  I want to keep the exact time but still be able to pull by the date itself   I want to compare 12 3 89 12 43 34 and 12 3 89 11 22 12 and have it disregard the actual time of day so both of these are considered the same   I guess I can set all the times of day to 00 00 00 before I compare but I actually do want to know the time of day I just also want to be able to compare by date only   I found some code that has the same issue and they compare the year  month and day separately  Is there a better way to do this

User · Answer

In your join or where clause  use the Date property of the column  Behind the scenes  this executes a CONVERT DATE   lt expression gt   operation  This should allow you to compare dates without the time

User · Answer

You can try   if dtOne Year    dtTwo Year  amp  amp  dtOne Month    dtTwo Month  amp  amp  dtOne Day    dtTwo Day

User · Answer

For a true comparison  you can use   dateTime1 Date CompareTo dateTime2 Date

User · Answer

You can use Equals or CompareTo   Equals  Returns a value indicating whether two DateTime instances have the same date and time value   CompareTo Return Value    Less than zero   If this instance is earlier than value  Zero   If this instance is the same as value  Greater than zero   If this instance is later than value    DateTime is nullable   DateTime  first   new DateTime 1992 02 02 20 50 1   DateTime  second   new DateTime 1992  02  02  20  50  2    if  first Value Date Equals second Value Date         Console WriteLine  Equal        or  DateTime  first   new DateTime 1992 02 02 20 50 1   DateTime  second   new DateTime 1992  02  02  20  50  2     var compare   first Value Date CompareTo second Value Date    switch  compare        case 1          Console WriteLine  this instance is later than value             break      case 0          Console WriteLine  this instance is the same as value             break      default          Console WriteLine  this instance is earlier than value             break      DateTime is not nullable   DateTime first   new DateTime 1992 02 02 20 50 1   DateTime second   new DateTime 1992  02  02  20  50  2    if  first Date Equals second Date         Console WriteLine  Equal        or  DateTime first   new DateTime 1992 02 02 20 50 1   DateTime second   new DateTime 1992  02  02  20  50  2     var compare   first Date CompareTo second Date    switch  compare        case 1          Console WriteLine  this instance is later than value             break      case 0          Console WriteLine  this instance is the same as value             break      default          Console WriteLine  this instance is earlier than value             break

User · Answer

This is how I do this in order to work with LINQ   DateTime date time to compare   DateTime Now    Compare only date parts context YourObject FirstOrDefault r   gt                  EntityFunctions TruncateTime r date     EntityFunctions TruncateTime date to compare      If you only use dtOne Date    dtTwo Date it wont work with LINQ  Error  The specified type member  Date  is not supported in LINQ to Entities

User · Answer

DateTime dt1 DateTime ParseExact date1  dd-MM-yyyy  null   DateTime dt2 DateTime ParseExact date2  dd-MM-yyyy  null    int cmp dt1 CompareTo dt2       if cmp gt 0              date1 is greater means date1 is comes after date2      else if cmp lt 0              date2 is greater means date1 is comes after date1      else             date1 is same as date2

User · Answer

DateTime  NextChoiceDate   new DateTime    DateTIme  NextSwitchDate   new DateTime    if NextChoiceDate Value Date    NextSwitchDate Value Date    Console WriteLine  Equal        You can use this if you are using nullable DateFields

User · Answer

try using the Date property on the DateTime Object     if dtOne Date    dtTwo Date

User · Answer

If you re using Entity Framework  lt  v6 0  then use EntityFunctions TruncateTime If you re using Entity Framework    v6 0  then use DbFunctions TruncateTime    Use either  based on your EF version  around any DateTime class property you want to use inside your Linq query  Example  var list   db Cars Where c  gt  DbFunctions TruncateTime c CreatedDate                                           gt   DbFunctions TruncateTime DateTime UtcNow

User · Answer

DateTime dt1   DateTime Now Date  DateTime dt2   Convert ToDateTime TextBox4 Text Trim    Date  if  dt1  gt   dt2        MessageBox Show  Valid Date      else       MessageBox Show  Invalid Date    Please Give Correct Date

User · Answer

int o1   date1 IndexOf  -            int o2   date1 IndexOf  -  o1   1           string str11   date1 Substring 0 o1           string str12   date1 Substring o1   1  o2 - o1 - 1           string str13   date1 Substring o2   1            int o21   date2 IndexOf  -            int o22   date2 IndexOf  -   o1   1           string str21   date2 Substring 0  o1           string str22   date2 Substring o1   1  o2 - o1 - 1           string str23   date2 Substring o2   1            if  Convert ToInt32 str11   gt  Convert ToInt32 str21                               else if  Convert ToInt32 str12   gt  Convert ToInt32 str22                               else if  Convert ToInt32 str12     Convert ToInt32 str22   amp  amp  Convert ToInt32 str13   gt  Convert ToInt32 str23

User · Answer

DateTime econvertedDate   Convert ToDateTime end date   DateTime sconvertedDate   Convert ToDateTime start date    TimeSpan age   econvertedDate Subtract sconvertedDate   Int32 diff   Convert ToInt32 age TotalDays     The diff value represents the number of days for the age   If the value is negative the start date falls after the end date   This is a good check

[c#] How to compare only Date without Time in DateTime types in Linq to SQL with Entity Framework?

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