How can I get the difference of days between two DateTime objects?
private static string DaysAfterAYear(DateTime initialDate)
{
DateTime endDate = initialDate.AddYears(1);
endDate = endDate.AddMonths(1);
return ??
}
I need to get the difference between initialDate and endDate.
Use the subtract method:
static void Main(string[] args)
{
DateTime begin = DateTime.Now;
DateTime end = begin.AddYears(1).AddMonths(1);
var result = end.Subtract(begin).TotalDays;
}
DateTime dt1 = new DateTime(2011,01,01);
DateTime dt2 = new DateTime(2011,01,20);
int ireturn = (int)dt2.Subtract(dt1).TotalDays;
Subtracting DateTimes will yield a TimeSpan:
var elapsedDays = (endDate - initialDate).TotalDays;
DateTime start = DateTime.Now;
DateTime end = DateTime.Now.AddDays(5);
TimeSpan span = end.Subtract(start);
return span.Days;
int days = 10;
DateTime initialDate = DateTime.Now;
DateTime endDate = DateTime.Now.AddDays(days);
TimeSpan duration = endDate.Subtract(initialDate);
In this example you can use either span.Days or span.TotalDays, however you have to be very careful with TimeSpan properties. If you look at the TotalHours vs Hours for example you'll see that they are not the same.
The Hours property is the number of hours remaining after the days property has been taken off (in this case zero), the Total hours is the TimeSpan represented in hours.
Related
Say I consider Sunday - Saturday as a week, how do I get all the dates of the current week in c#?
For example, current date is 30th March 2017, the output I need is,
26-March-2017,
27-March-2017,
28-March-2017,
29-March-2017,
30-March-2017,
31-March-2017,
01-April-2017
You can try DateTimeFormat to find out current week's starting date and Linq to generate the string:
DateTime startOfWeek = DateTime.Today.AddDays(
(int) CultureInfo.CurrentCulture.DateTimeFormat.FirstDayOfWeek -
(int) DateTime.Today.DayOfWeek);
string result = string.Join("," + Environment.NewLine, Enumerable
.Range(0, 7)
.Select(i => startOfWeek
.AddDays(i)
.ToString("dd-MMMM-yyyy")));
In case of en-US culture you'll get (week starts from Sunday)
26-March-2017, // <- starts from Sunday
27-March-2017,
28-March-2017,
29-March-2017,
30-March-2017,
31-March-2017,
01-April-2017
In case of, say, ru-RU culture you'll get (week starts from Monday)
27-марта-2017, // <- Starts from Monday
28-марта-2017,
29-марта-2017,
30-марта-2017,
31-марта-2017,
01-апреля-2017,
02-апреля-2017
Assuming that Sunday will be the start day of the week, as it is mentioned in the question I suggest following solution.
var today = DateTime.Now.Date; // This can be any date.
Console.WriteLine(today.DayOfWeek);
var day = (int)today.DayOfWeek; //Number of the day in week. (0 - Sunday, 1 - Monday... and so On)
Console.WriteLine(day);
const int totalDaysOfWeek = 7; // Number of days in a week stays constant.
for (var i = -day; i < -day + totalDaysOfWeek; i++)
{
Console.WriteLine(today.AddDays(i).Date);
}
I found this here
DayOfWeek Day = DateTime.Now.DayOfWeek;
int Days = Day - DayOfWeek.Monday; //here you can set your Week Start Day
DateTime WeekStartDate = DateTime.Now.AddDays(-Days);
DateTime WeekEndDate1 = WeekStartDate.AddDays(1);
DateTime WeekEndDate2 = WeekStartDate.AddDays(2);
DateTime WeekEndDate3 = WeekStartDate.AddDays(3);
DateTime WeekEndDate4 = WeekStartDate.AddDays(4);
DateTime WeekEndDate5 = WeekStartDate.AddDays(5);
DateTime WeekEndDate6 = WeekStartDate.AddDays(6);
In my opinion, an extension method is the most useful approach:
public static IEnumerable<DateTime> GetDatesOfWeek(this DateTime date, CultureInfo ci) {
Int32 firstDayOfWeek = (Int32) ci.DateTimeFormat.FirstDayOfWeek;
Int32 dayOfWeek = (Int32) date.DayOfWeek;
DateTime startOfWeek = date.AddDays(firstDayOfWeek - dayOfWeek);
var valuesDaysOfWeek = Enum.GetValues(typeof(DayOfWeek)).Cast<Int32>();
return valuesDaysOfWeek.Select(v => startOfWeek.AddDays(v));
}
Use as follows:
DateTime myDate = DateTime.Today;
IEnumerable<DateTime> result = myDate.GetDatesOfWeek(CultureInfo.CurrentCulture);
foreach ( DateTime d in result ) {
Console.WriteLine(d);
}
I have this:
string dataNow = DateTime.Today.tostring();
string dateAfter = dateNow + ( 20 days);
How do I find the date in 20 days?
How do I find the number of days in the month?
Your likely intent is to work with a date as a date type DateTime. In which case, don't call ToString() before you've completed manipulating the date:
string dataNow = DateTime.Today.AddDays(20).ToString();
DateTime.AddDays
After update:
To get the number of days in the current month:
var date = DateTime.Today;
int days = DateTime.DaysInMonth(date.Year, date.Month);
DateTime.DaysInMonth
This should do it:
DateTime dtNow = DateTime.Today;
string dateNow = dtNow.ToString();
string dateAfter = dtNow.AddDays(20).ToString();
int DaysInTheMonth = DateTime.DaysInMonth(dtNow.Year, dtNow.Month);
DateTime today = DateTime.Today;
DateTime later = today.AddDays(20);
string todayAsString = today.ToString("d");
string laterAsString = later.ToString("d");
int daysThisMonth = DateTime.DaysInMonth(today.Year, today.Month);
int daysLaterMonth = DateTime.DaysInMonth(later.Year, later.Month);
I have two DateTimes, and I want to get all DateTimes between these Dates. Such as, if my Dates are like 01.01.2010 - 05.01.2010, my function should return me a list of date (List), and it must contain 01.01.2010, 02.01.2010, 03.01.2010, 04.01.2010, and 05.01.2010.
I wrote a function like this. It works fine, if my dates are in a month. It won't work if my dates are like 01.01.2010 - 05.02.2010. Because the month changed, and my function can't handle it. Is there a function in C# that returns all dates between two dates? Or how can I handle month change?
public void GetAllDatesAndInitializeTickets(DateTime startingDate, DateTime endingDate)
{
List<DateTime> allDates = new List<DateTime>();
int starting = startingDate.Day;
int ending = endingDate.Day;
for (int i = starting; i <= ending; i++)
{
allDates.Add(new DateTime(startingDate.Year, startingDate.Month, i));
}
Question solved, see Tim Robinson's simple answer to use.
You can use DateTime objects directly in the loop, in place of your int. DateTime.AddDays handles month ends correctly.
for (DateTime date = startingDate; date <= endingDate; date = date.AddDays(1))
allDates.Add(date);
How about something like this?
public IEnumerable<DateTime> DateRange(DateTime fromDate, DateTime toDate)
{
return Enumerable.Range(0, toDate.Subtract(fromDate).Days + 1)
.Select(d => fromDate.AddDays(d));
}
Edit: Tested now. :)
public IEnumerable<DateTime> GetAllDatesAndInitializeTickets(DateTime startingDate, DateTime endingDate)
{
if (endingDate < startingDate)
{
throw new ArgumentException("endingDate should be after startingDate");
}
var ts = endingDate - startingDate;
for (int i = 0; i < ts.TotalDays; i++)
{
yield return startingDate.AddDays(i);
}
}
You were so close... just don't use the day, use the whole date.
static IEnumerable<DateTime> GetAllDatesAndInitializeTickets(DateTime startingDate, DateTime endingDate)
{
List<DateTime> allDates = new List<DateTime>();
for (DateTime i = startingDate; i <= endingDate; i = i.AddDays(1))
{
allDates.Add(i);
}
return allDates.AsReadOnly();
}
Given a lowerdate value and higher date value in String and a frequency as the third parameter this method should return a dictionary of dates; where the key is the start value of a date range and the value is the respective range.
This works fine if the frequency is either weekly or monthly- you can customize it as per your need.
The date values passed should be in proper format or you might need to format it using tryParseExact or something like that.
protected static Dictionary<DateTime, String> getDateRange(String lowerDate, String higherDate, String frequency)
{
DateTime startDate, endDate;
startDate = Convert.ToDateTime(lowerDate);
endDate = Convert.ToDateTime(higherDate);
Dictionary<DateTime, String> returnDict = new Dictionary<DateTime, String>();
while (frequency.Equals("weekly") ? (startDate.AddDays(7) <= endDate) : (startDate.AddMonths(1) <= endDate))
{
if (frequency.Equals("weekly"))
{
returnDict.Add(startDate, startDate + "-" + startDate.AddDays(7));
startDate = startDate.AddDays(8);
}
if (frequency.Equals("monthly"))
{
returnDict.Add(startDate, startDate + "-" + startDate.AddMonths(1));
startDate = startDate.AddMonths(1).AddDays(1);
}
}
returnDict.Add(startDate, startDate + "-" + endDate);
return returnDict;
}
The top solutions will fail if the date includes different hours. Here is a solution getting all hours and all days:
All Days:
static public List<string> get_days_between_two_dates(DateTime start_date, DateTime end_date)
{
List<string> days_list = new List<string>();
DateTime temp_start;
DateTime temp_end;
//--Normalize dates by getting rid of minues since they will get in the way when doing the loop
temp_start = new DateTime(start_date.Year, start_date.Month, start_date.Day);
temp_end = new DateTime(end_date.Year, end_date.Month, end_date.Day);
//--Example Should return
//--1-12-2014 5:59AM - 1-13-2014 6:01AM return 12 and 13
for (DateTime date = temp_start; date <= temp_end; date = date.AddDays(1))
{
days_list.Add(date.ToShortDateString());
}
return days_list;
}
All Hours:
static public List<string> get_hours_between_two_dates(DateTime start_date, DateTime end_date)
{
List<string> hours_24_list = new List<string>();
DateTime temp_start;
DateTime temp_end;
//--Normalize dates by getting rid of minutes since they will get in the way when doing the loop
temp_start = new DateTime(start_date.Year, start_date.Month, start_date.Day, start_date.Hour, 0, 0);
temp_end = new DateTime(end_date.Year, end_date.Month, end_date.Day, end_date.Hour, 0, 0);
//--Example Should return
//--5:59AM - 6:01AM return 5am and 6am
for (DateTime date = temp_start; date <= temp_end; date = date.AddHours(1))
{
hours_24_list.Add(date.ToShortTimeString());
}
return hours_24_list;
}
Based on your starting code and using the features available at the time of writing, here is a quick console app to demonstrate how to do it - use AddDays() instead:
class Program
{
static void Main(string[] args)
{
GetDates(new DateTime(2010, 1, 1), new DateTime(2010, 2, 5));
Console.ReadKey();
}
static List<DateTime> GetDates(DateTime startDate, DateTime endDate)
{
List<DateTime> dates = new List<DateTime>();
while ((startDate = startDate.AddDays(1)) < endDate)
dates.Add(startDate);
return dates;
}
}
Although I think the Enumerable.Range() answer from Matt is a nicer solution.
static IEnumerable<DateTime> GetAllDatesAndInitializeTickets(DateTime startingDate, DateTime endingDate)
{
List<DateTime> allDates = new List<DateTime>();
for (DateTime i = startingDate; i <= endingDate; i = i.AddDays(1))
{
allDates.Add(i);
}
return allDates.AsReadOnly();
}
I can't think of an easy one or two liner that would get the previous months first day and last day.
I am LINQ-ifying a survey web app, and they squeezed a new requirement in.
The survey must include all of the service requests for the previous month. So if it is April 15th, I need all of Marches request ids.
var RequestIds = (from r in rdc.request
where r.dteCreated >= LastMonthsFirstDate &&
r.dteCreated <= LastMonthsLastDate
select r.intRequestId);
I just can't think of the dates easily without a switch. Unless I'm blind and overlooking an internal method of doing it.
var today = DateTime.Today;
var month = new DateTime(today.Year, today.Month, 1);
var first = month.AddMonths(-1);
var last = month.AddDays(-1);
In-line them if you really need one or two lines.
The way I've done this in the past is first get the first day of this month
dFirstDayOfThisMonth = DateTime.Today.AddDays( - ( DateTime.Today.Day - 1 ) );
Then subtract a day to get end of last month
dLastDayOfLastMonth = dFirstDayOfThisMonth.AddDays (-1);
Then subtract a month to get first day of previous month
dFirstDayOfLastMonth = dFirstDayOfThisMonth.AddMonths(-1);
using Fluent DateTime https://github.com/FluentDateTime/FluentDateTime
var lastMonth = 1.Months().Ago().Date;
var firstDayOfMonth = lastMonth.FirstDayOfMonth();
var lastDayOfMonth = lastMonth.LastDayOfMonth();
DateTime LastMonthLastDate = DateTime.Today.AddDays(0 - DateTime.Today.Day);
DateTime LastMonthFirstDate = LastMonthLastDate.AddDays(1 - LastMonthLastDate.Day);
I use this simple one-liner:
public static DateTime GetLastDayOfPreviousMonth(this DateTime date)
{
return date.AddDays(-date.Day);
}
Be aware, that it retains the time.
An approach using extension methods:
class Program
{
static void Main(string[] args)
{
DateTime t = DateTime.Now;
DateTime p = t.PreviousMonthFirstDay();
Console.WriteLine( p.ToShortDateString() );
p = t.PreviousMonthLastDay();
Console.WriteLine( p.ToShortDateString() );
Console.ReadKey();
}
}
public static class Helpers
{
public static DateTime PreviousMonthFirstDay( this DateTime currentDate )
{
DateTime d = currentDate.PreviousMonthLastDay();
return new DateTime( d.Year, d.Month, 1 );
}
public static DateTime PreviousMonthLastDay( this DateTime currentDate )
{
return new DateTime( currentDate.Year, currentDate.Month, 1 ).AddDays( -1 );
}
}
See this link
http://www.codeplex.com/fluentdatetime
for some inspired DateTime extensions.
The canonical use case in e-commerce is credit card expiration dates, MM/yy. Subtract one second instead of one day. Otherwise the card will appear expired for the entire last day of the expiration month.
DateTime expiration = DateTime.Parse("07/2013");
DateTime endOfTheMonthExpiration = new DateTime(
expiration.Year, expiration.Month, 1).AddMonths(1).AddSeconds(-1);
If there's any chance that your datetimes aren't strict calendar dates, you should consider using enddate exclusion comparisons...
This will prevent you from missing any requests created during the date of Jan 31.
DateTime now = DateTime.Now;
DateTime thisMonth = new DateTime(now.Year, now.Month, 1);
DateTime lastMonth = thisMonth.AddMonths(-1);
var RequestIds = rdc.request
.Where(r => lastMonth <= r.dteCreated)
.Where(r => r.dteCreated < thisMonth)
.Select(r => r.intRequestId);
DateTime now = DateTime.Now;
int prevMonth = now.AddMonths(-1).Month;
int year = now.AddMonths(-1).Year;
int daysInPrevMonth = DateTime.DaysInMonth(year, prevMonth);
DateTime firstDayPrevMonth = new DateTime(year, prevMonth, 1);
DateTime lastDayPrevMonth = new DateTime(year, prevMonth, daysInPrevMonth);
Console.WriteLine("{0} {1}", firstDayPrevMonth.ToShortDateString(),
lastDayPrevMonth.ToShortDateString());
This is a take on Mike W's answer:
internal static DateTime GetPreviousMonth(bool returnLastDayOfMonth)
{
DateTime firstDayOfThisMonth = DateTime.Today.AddDays( - ( DateTime.Today.Day - 1 ) );
DateTime lastDayOfLastMonth = firstDayOfThisMonth.AddDays (-1);
if (returnLastDayOfMonth) return lastDayOfLastMonth;
return firstDayOfThisMonth.AddMonths(-1);
}
You can call it like so:
dateTimePickerFrom.Value = GetPreviousMonth(false);
dateTimePickerTo.Value = GetPreviousMonth(true);
var lastMonth = DateTime.Today.AddMonths(-1);
dRet1 = new DateTime(lastMonth.Year, lastMonth.Month, 1);
dRet2 = new DateTime(lastMonth.Year, lastMonth.Month, DateTime.DaysInMonth(lastMonth.Year, lastMonth.Month));
I would like to know many minutes between 2 dates?
Example : Now - tommorow at the exact time would return me 1440.
DateTime dt1 = DateTime.Now;
DateTime dt2 = DateTime.Now.AddDays(1);
int diff = dt2.Subtract(dt1).TotalMinutes;
Look at the TimeSpan class.
DateTime date1 = DateTime.Now;
DateTime date2 = DateTime.Now.AddDays(1);
TimeSpan diff = date2.Subtract(date1);
Console.WriteLine(diff.Minutes);
DateTime currentTime = DateTime.Now;
DateTime tommorowTime = currentTime.AddDays(1);
TimeSpan diffTime = tommorowTime - currentTime ;
Console.WriteLine(diffTime.TotalMinutes);