I need to know if a Date is between a DateRange. I have three dates:
// The date range
DateTime startDate;
DateTime endDate;
DateTime dateToCheck;
The easy solution is doing a comparison, but is there a smarter way to do this?
Nope, doing a simple comparison looks good to me:
return dateToCheck >= startDate && dateToCheck < endDate;
Things to think about though:
DateTime is a somewhat odd type in terms of time zones. It could be UTC, it could be "local", it could be ambiguous. Make sure you're comparing apples with apples, as it were.
Consider whether your start and end points should be inclusive or exclusive. I've made the code above treat it as an inclusive lower bound and an exclusive upper bound.
Usually I create Fowler's Range implementation for such things.
public interface IRange<T>
{
T Start { get; }
T End { get; }
bool Includes(T value);
bool Includes(IRange<T> range);
}
public class DateRange : IRange<DateTime>
{
public DateRange(DateTime start, DateTime end)
{
Start = start;
End = end;
}
public DateTime Start { get; private set; }
public DateTime End { get; private set; }
public bool Includes(DateTime value)
{
return (Start <= value) && (value <= End);
}
public bool Includes(IRange<DateTime> range)
{
return (Start <= range.Start) && (range.End <= End);
}
}
Usage is pretty simple:
DateRange range = new DateRange(startDate, endDate);
range.Includes(date)
You could use extension methods to make it a little more readable:
public static class DateTimeExtensions
{
public static bool InRange(this DateTime dateToCheck, DateTime startDate, DateTime endDate)
{
return dateToCheck >= startDate && dateToCheck < endDate;
}
}
Now you can write:
dateToCheck.InRange(startDate, endDate)
You can use:
return (dateTocheck >= startDate && dateToCheck <= endDate);
I’ve found the following library to be the most helpful when doing any kind of date math. I’m still amazed nothing like this is part of the .Net framework.
http://www.codeproject.com/Articles/168662/Time-Period-Library-for-NET
Following on from Sergey's answer, I think this more generic version is more in line with Fowler's Range idea, and resolves some of the issues with that answer such as being able to have the Includes methods within a generic class by constraining T as IComparable<T>. It's also immutable like what you would expect with types that extend the functionality of other value types like DateTime.
public struct Range<T> where T : IComparable<T>
{
public Range(T start, T end)
{
Start = start;
End = end;
}
public T Start { get; }
public T End { get; }
public bool Includes(T value) => Start.CompareTo(value) <= 0 && End.CompareTo(value) >= 0;
public bool Includes(Range<T> range) => Start.CompareTo(range.Start) <= 0 && End.CompareTo(range.End) >= 0;
}
In case anyone wants it as a Validator
using System;
using System.ComponentModel.DataAnnotations;
namespace GROOT.Data.Validation;
internal class DateRangeAttribute : ValidationAttribute
{
public string EndDate;
public string StartDate;
public override bool IsValid(object value)
{
return (DateTime)value >= DateTime.Parse(StartDate) && (DateTime)value <= DateTime.Parse(EndDate);
}
}
Usage
[DateRange(
StartDate = "01/01/2020",
EndDate = "01/01/9999",
ErrorMessage = "Property is outside of range")
]
I have an object Member,
Member
PropertyA
PropertyZ
Membership[] Memberships
and Membership object is
Membership
PropertyA
PropertyZ
string Status
DateTime? StartDate
DateTime? EndDate
If I now have,
var members = GetAllMembers(DateTime.Now);
I want to find out if member has any active membership today,
// iterating through each member here
if(member.Memberships.Any())
{
// check if user has any membership duration that falls into
// today's date and membership status is also "active"
}
Problem is,
I am not sure how to check if any membership duration that falls into today's date and membership status is also "active"
to check that the targetdt(DateTime.Now) is between StartDate & EndDate:
if (member.Memberships.Any(x=>targetDt.Ticks > x.StartDate.Ticks && targetDt.Ticks < x.EndDate.Ticks && x.Status=="Active"))
{
// Has membership on targetDt.
}
I assume that null value for start or end date means 'open' interval
var today = DateTime.Now;
var activeMembers = allMembers.Where(m =>
m.Memberships.Any(ms =>
ms.Status == "Active" &&
(ms.StartDate == null || ms.StartDate <= today) && (ms.EndDate == null || today <= ms.EndDate)));
So I would structure your main classes slightly more different from what you have now. This it to get of having to compare on strings for the status, but since I don't know exactly how the active property is set but I would assume that for a membership to be active the start and (optional) end date have to be smaller than and greater than today's date.
class Member
{
private readonly IList<Membership> memberships;
public Member()
{
memberships = new List<Membership>();
}
public ReadOnlyCollection<Membership> Memberships
{
get
{
return new ReadOnlyCollection<Membership>(memberships);
}
}
}
class Membership
{
private readonly DateTime endDate;
private readonly DateTime startDate;
public Membership(DateTime startDate)
{
this.startDate = startDate;
}
DateTime StartDate
{
get
{
return this.startDate;
}
}
DateTime? EndDate
{
get
{
return endDate;
}
}
public Status Status
{
get
{
return CalculateMemebershipStatus();
}
}
private Status CalculateMemebershipStatus()
{
var todaysDate = DateTime.Today;
if (StartDate > todaysDate)
{
return Status.Deactivated;
}
if (!EndDate.HasValue)
{
return Status.Active;
}
if (todaysDate < EndDate.Value)
{
return Status.Active;
}
return Status.Deactivated;
}
}
enum Status
{
Active,
Deactivated
}
And when you need to find out all the members that have an active membership today you can do:
var memberCollection = new List<Member>();
...
var activeMembers = memberCollection.Where(x => x.Memberships.Any(y=> y.Status == Status.Active));
So this will go through your member collection and select the ones that have an active status today. Although as previously said this depends on how you build the active property but this is more contained in that testing for the activeness of the membership based on the date is done within the membership object. So the consumer of this data doesn't need to know how to say that a membership is active they simply only need to know that some will be active and others will be deactivated.
I want to write an extension method that adds one day to a Nullable DateTime, but modifies the date itself.
I want to use it as follows:
someDate.AddOneDay();
This directly changes the value of someDate.
The code I initially wrote was:
public static DateTime? AddOneDay(this DateTime? date)
{
if (date.HasValue)
{
date.Value = date.Value.AddDays(1);
}
return null;
}
but this doesn't work since the reference is changed thus calling it this way
won't change the value of someDate.
Is there a way to achieve this and avoid code like:
someDate = someDate.AddOneDay();
Also I was thinking for some setter of the DateTime properties, but they don't have any..
public int Day { get; }
public int Month { get; }
public int Year { get; }
You can't DateTime is immutable, and should stay that way.
Just do:
someDate = someDate.AddOneDay();
And if you want to be more specific, you could rename your function to:
DateTime? someDate = someDate.AddOneDayOrDefault();
old school %)
public static void AddOneDay(ref DateTime date)
{
if (date != null) date = date.AddDays(1);
}
usage:
DateTime date = DateTime.Now;
AddOneDay(ref date);
UPD
one line version of method:
public static void AddOneDay(ref DateTime date) { date = date.AddDays(1); }
C# does support a similar feature, even for mutable values, which is the use of += on nullable values:
DateTime? date = GetDate();
var oneDay = TimeSpan.FromDays(1);
date += oneDay;
I need to remove time portion of date time or probably have the date in following format in object form not in the form of string.
06/26/2009 00:00:00:000
I can not use any string conversion methods as I need the date in object form.
I tried first converting the DateTime to a string, remove the time specific date from it, but it adds 12:00:00 AM as soon as I convert it back to DateTime object back again.
Use the Date property:
var dateAndTime = DateTime.Now;
var date = dateAndTime.Date;
The date variable will contain the date, the time part will be 00:00:00.
You can use format strings to give the output string the format you like.
DateTime dateAndTime = DateTime.Now;
Console.WriteLine(dateAndTime.ToString("dd/MM/yyyy")); // Will give you smth like 25/05/2011
Read more about Custom date and time format strings.
Use the method ToShortDateString. See the documentation http://msdn.microsoft.com/en-us/library/system.datetime.toshortdatestring.aspx
var dateTimeNow = DateTime.Now; // Return 00/00/0000 00:00:00
var dateOnlyString = dateTimeNow.ToShortDateString(); //Return 00/00/0000
Have a look at the DateTime.Date property.
Gets the date component of this instance.
The Date property will return the date at midnight.
One option could be to get the individual values (day/month/year) separately and store it in the type you want.
var dateAndTime = DateTime.Now;
int year = dateAndTime.Year;
int month = dateAndTime.Month;
int day = dateAndTime.Day;
string.Format("{0}/{1}/{2}", month, day, year);
None of the above answers solved my problem on winforms.
the easiest way to reach ONLY date is the simple function in Datetime:
DateTime dt = DateTime.now;
String BirthDate = dt.ToShortDateString();
You will only have date in Birthday string .
Try to make your own Structure for that. DateTime object will have date and time both
You can't. A DateTime in .NET always have a time, defaulting to 00:00:00:000. The Date property of a DateTime is also a DateTime (!), thus having a time defaulting to 00:00:00:000 as well.
This is a shortage in the .NET Framework, and it could be argued that DateTime in .NET violates the Single Responsibility Principle.
The easiest way is something like this and it will return only the date:
var date = DateTime.Now.ToShortDateString();
Here is another method using String.Format
DateTime todaysDate = DateTime.UtcNow;
string dateString = String.Format("{0:dd/MM/yyyy}", todaysDate);
Console.WriteLine("Date with Time: "+ todaysDate.ToString());
Console.WriteLine("Date Only : " + dateString);
Output:
Date with Time: 9/4/2016 11:42:16 AM
Date Only : 04/09/2016
This also works if the Date Time is stored in database.
For More Date and Time formatting check these links:
Reference 1
Reference 2
Hope helps.
DateTime.Date
var newDate = DateTime.Now; //newDate.Date property is date portion of DateTime
This way of get only date without time
DateTime date = DateTime.Now;
string Strdateonly = date.ToString("d");
Output = 5/16/2015
Use date.ToShortDateString() to get the date without the time component
var date = DateTime.Now
var shortDate = date.ToShortDateString() //will give you 16/01/2019
use date.ToString() to customize the format of the date
var date = DateTime.Now
var shortDate = date.ToString('dd-MMM-yyyy') //will give you 16-Jan-2019
Since .NET 6 / C# 10 you can do this:
var dateOnly = DateOnly.FromDateTime(dateTime);
I wrote a DateOnly structure. This uses a DateTime under the skin but no time parts are exposed publically:
using System;
public struct DateOnly : IComparable, IFormattable, IComparable<DateOnly>, IEquatable<DateOnly>
{
private DateTime _dateValue;
public int CompareTo(object obj)
{
if (obj == null)
{
return 1;
}
DateOnly otherDateOnly = (DateOnly)obj;
if (otherDateOnly != null)
{
return ToDateTime().CompareTo(otherDateOnly.ToDateTime());
}
else
{
throw new ArgumentException("Object is not a DateOnly");
}
}
int IComparable<DateOnly>.CompareTo(DateOnly other)
{
return this.CompareToOfT(other);
}
public int CompareToOfT(DateOnly other)
{
// If other is not a valid object reference, this instance is greater.
if (other == new DateOnly())
{
return 1;
}
return this.ToDateTime().CompareTo(other.ToDateTime());
}
bool IEquatable<DateOnly>.Equals(DateOnly other)
{
return this.EqualsOfT(other);
}
public bool EqualsOfT(DateOnly other)
{
if (other == new DateOnly())
{
return false;
}
if (this.Year == other.Year && this.Month == other.Month && this.Day == other.Day)
{
return true;
}
else
{
return false;
}
}
public static DateOnly Now()
{
return new DateOnly(DateTime.Now.Year, DateTime.Now.Month, DateTime.Now.Day);
}
public static bool TryParse(string s, ref DateOnly result)
{
DateTime dateValue = default(DateTime);
if (DateTime.TryParse(s, out dateValue))
{
result = new DateOnly(dateValue.Year, dateValue.Month, dateValue.Day);
return true;
}
else
{
return false;
}
}
public static DateOnly Parse(string s)
{
DateTime dateValue = default(DateTime);
dateValue = DateTime.Parse(s);
return new DateOnly(dateValue.Year, dateValue.Month, dateValue.Day);
}
public static DateOnly ParseExact(string s, string format)
{
CultureInfo provider = CultureInfo.InvariantCulture;
DateTime dateValue = default(DateTime);
dateValue = DateTime.ParseExact(s, format, provider);
return new DateOnly(dateValue.Year, dateValue.Month, dateValue.Day);
}
public DateOnly(int yearValue, int monthValue, int dayValue) : this()
{
Year = yearValue;
Month = monthValue;
Day = dayValue;
}
public DateOnly AddDays(double value)
{
DateTime d = new DateTime(this.Year, this.Month, this.Day);
d = d.AddDays(value);
return new DateOnly(d.Year, d.Month, d.Day);
}
public DateOnly AddMonths(int months)
{
DateTime d = new DateTime(this.Year, this.Month, this.Day);
d = d.AddMonths(months);
return new DateOnly(d.Year, d.Month, d.Day);
}
public DateOnly AddYears(int years)
{
DateTime d = new DateTime(this.Year, this.Month, this.Day);
d = d.AddYears(years);
return new DateOnly(d.Year, d.Month, d.Day);
}
public DayOfWeek DayOfWeek
{
get
{
return _dateValue.DayOfWeek;
}
}
public DateTime ToDateTime()
{
return _dateValue;
}
public int Year
{
get
{
return _dateValue.Year;
}
set
{
_dateValue = new DateTime(value, Month, Day);
}
}
public int Month
{
get
{
return _dateValue.Month;
}
set
{
_dateValue = new DateTime(Year, value, Day);
}
}
public int Day
{
get
{
return _dateValue.Day;
}
set
{
_dateValue = new DateTime(Year, Month, value);
}
}
public static bool operator == (DateOnly aDateOnly1, DateOnly aDateOnly2)
{
return (aDateOnly1.ToDateTime() == aDateOnly2.ToDateTime());
}
public static bool operator != (DateOnly aDateOnly1, DateOnly aDateOnly2)
{
return (aDateOnly1.ToDateTime() != aDateOnly2.ToDateTime());
}
public static bool operator > (DateOnly aDateOnly1, DateOnly aDateOnly2)
{
return (aDateOnly1.ToDateTime() > aDateOnly2.ToDateTime());
}
public static bool operator < (DateOnly aDateOnly1, DateOnly aDateOnly2)
{
return (aDateOnly1.ToDateTime() < aDateOnly2.ToDateTime());
}
public static bool operator >= (DateOnly aDateOnly1, DateOnly aDateOnly2)
{
return (aDateOnly1.ToDateTime() >= aDateOnly2.ToDateTime());
}
public static bool operator <= (DateOnly aDateOnly1, DateOnly aDateOnly2)
{
return (aDateOnly1.ToDateTime() <= aDateOnly2.ToDateTime());
}
public static TimeSpan operator - (DateOnly aDateOnly1, DateOnly aDateOnly2)
{
return (aDateOnly1.ToDateTime() - aDateOnly2.ToDateTime());
}
public override string ToString()
{
return _dateValue.ToShortDateString();
}
public string ToString(string format)
{
return _dateValue.ToString(format);
}
public string ToString(string fmt, IFormatProvider provider)
{
return string.Format("{0:" + fmt + "}", _dateValue);
}
public string ToShortDateString()
{
return _dateValue.ToShortDateString();
}
public string ToDbFormat()
{
return string.Format("{0:yyyy-MM-dd}", _dateValue);
}
}
This is converted from VB.NET, so apologies if some conversions are not 100%
I'm surprised no one has mentioned DateTime.Today
var date = DateTime.Today;
// {7/1/2014 12:00:00 AM}
See MSDN
If you are converting it to string, you can easily do it like this.
I'm taking date as your DateTime object.
date.ToString("d");
This will give you only the date.
You Can Try This for the Only Date From the Datetime
String.Format("{0:d/M/YYYY}",dt);
Where dt is the DateTime
Came across this post when trying to solve the original Q.
I am using Asp.Net and after some research I have found when you are binding to the value of the date in code behind, you can drop the time so it will not display on screen.
C#:
DateTime Today = DateTime.Now;
aspx:
<%: this.Today.ToShortDateString() %>
use
DateTime.Now.ToString("dd-MM-yyyy");
I know this is an old post with many answers, but I haven't seen this way of removing the time portion. Suppose you have a DateTime variable called myDate, with the date with time part. You can create a new DateTime object from it, without the time part, using this constructor:
public DateTime(int year, int month, int day);
Like this:
myDate = new DateTime(myDate.Year, myDate.Month, myDate.Day);
This way you create a new DateTime object based on the old one, with 00:00:00 as time part.
You can use this simple code below.
Code: DateTime.Now.ToShortDateString();
Ex.
Console.WriteLine(DateTime.Now.ToShortDateString());
This is for C#10 and above where now a DateOnly and TimeOnly format is available. Using below format, you can extract DateOnly from a DateTime format.
DateOnly myDateNoTime = DateOnly.FromDateTime(DateTime.Now);
string dt = myCalender.SelectedDate.ToString();
string date = dt.Remove(10);
displayDate.Content = date;
If you take date from calender, with this we also get time. Which is not required all time. Using this we can remove time from date.
in my experience none of the said solutions worked, maybe because I wanted to remove the time from extracted date from database, but the code below worked fine:
var date = target_date.Value.ToString("dd/MM/yyyy");
Declare the variable as a string.
example :
public string dateOfBirth ;
then assign a value like :
dateOfBirth = ((DateTime)(datetimevaluefromDB)).ToShortDateString();
This could be simply done this way:
var dateOnly = new DateTime(dateTime.Year, dateTime.Month, dateTime.Day)
Create a struct that holds only the properties you want. Then an extension method to easily get that struct from an instance of DateTime.
public struct DateOnly
{
public int Day { get; set; }
public int Month { get; set; }
public int Year { get; set; }
}
public static class DateOnlyExtensions
{
public static DateOnly GetDateOnly(this DateTime dt)
{
return new DateOnly
{
Day = dt.Day,
Month = dt.Month,
Year = dt.Year
};
}
}
Usage
DateTime dt = DateTime.Now;
DateOnly result = dt.GetDateOnly();
To get only the date portion use the ToString() method,
example:
DateTime.Now.Date.ToString("dd/MM/yyyy")
Note:
The mm in the dd/MM/yyyy format must be capitalized
Add Date property to the DateTime variable
var dateTime = DateTime.Now
var onlyDate = dateTime.Date
Or You can use DataType annotation as well.
[DataType(DataType.Date)]
public DateTime dateTime {get; set;}
The DataType annotation is inside the System.ComponentModel.DataAnnotations namespace.
01.02.2010 0:00:00 -> 01.02.2010 anytime
01.02.2010 0:00:00 -> 01.02.2010 0:any minutes and seconds
so here is my date :
DateTime x;
it's
01.02.2010 0:00:00
as a string
x.Date.ToString()
here I compare date
DatarowsForOneDay = dt.Select("DailyRecTime= '" + x.ToString() + "'");
So how can I group by date + Hours without care about minutes and seconds.
You could write your own IEqualityComparer<DateTime> to only compare the parts of the DateTime you care about. LINQ's GroupBy has an overload that takes an IEqualityComparer. I had the same problem recently and did just that.
But you would have to call GroupBy before converting to strings. If you can't then you might want to create an IEqualityComparer<string> and parse the strings back to DateTime before comparing.
I don't have the original code with me right now. I re-typed this from memory and did not test it.
public class DateAndHourComparer : IEqualityComparer
{
public bool Equals(DateTime x, DateTime y)
{
var xAsDateAndHours = AsDateHoursAndMinutes(x);
var yAsDateAndHours = AsDateHoursAndMinutes(y);
return xAsDateAndHours.Equals(yAsDateAndHours);
}
private DateTime AsDateHoursAndMinutes(DateTime dateTime)
{
return new DateTime(dateTime.Year, dateTime.Month,
dateTime.Day, dateTime.Hour,
dateTime.Minute, 0);
}
public int GetHashCode(DateTime obj)
{
return AsDateHoursAndMinutes(obj).GetHashCode();
}
}
I never did the string based version, but it could use the above DateTime based code and look something like...
public class DateAndHourStringComparer : IEqualityComparer
{
private readonly DateAndHourComparer dateComparer = new DateAndHourComparer();
public bool Equals(string x, string y)
{
var xDate = DateTime.Parse(x);
var yDate = DateTime.Parse(y);
return dateComparer.Equals(xDate, yDate);
}
public int GetHashCode(string obj)
{
var date = DateTime.Parse(obj);
return dateComparer.GetHashCode(date);
}
}
I have not tested it, I did not add null checks or format checks. The code is meant to demonstrate the general idea.
You can pass a parameter with DateTime.ToString(string pattern).
More information # http://www.geekzilla.co.uk/View00FF7904-B510-468C-A2C8-F859AA20581F.htm.