I need to compare a date in C#
if the date is less than 12 months,i need to set a boolean value
My Code is
String d = "26/06/10";
DateTime dt = DateTime.ParseExact(d, "dd/MM/yy", null);
if ((dt > DateTime.Now.AddMonths(-12) ) )
{
Console.WriteLine("It is less than 12 months");
}
else
{
Console.WriteLine("It is more than 12 months");
}
Is the best way to compare date in c#.
similarly i need to compare date is less than two weeks or not
Any help appreciated
Thanks
sup
You could use TimeSpan to get the difference between two DateTime values
String d = "26/06/10";
DateTime dt = DateTime.ParseExact(d, "dd/MM/yy", null);
DateTime dt2 = DateTime.Now.AddMonths(-12);
TimeSpan ts = dt - dt2;
You can use ts.Days to compare
You could do
DateTime date2 = DateTime.Now.AddMonths(-12);
//Or if you want to neglect the time part you could do
DateTime date2 = new DateTime(DateTime.Now.Year,DateTime.Now.Month,DateTime.Now.Day,0,0,0).AddMonths(-12);
String d = "26/06/10";
DateTime date1 = DateTime.ParseExact(d, "dd/MM/yy", null);
int result = DateTime.Compare(date1, date2);
string res;
if (result < 0)
Console.WriteLine("It is less than 12 months");
else if (result == 0)
res = "is the equal";
else
Console.WriteLine("It is more than 12 months");
The problem with your code snippet is that it will output "It is more than 12 months" even if the date is equal.
For two weeks:
if (dt1.Subtract(dt2).Days > 14)
{
...
}
For 12 Months(one year) (Considering day of the month is not important):
var monthDifference = ((dt1.Year - dt2.Year) * 12) + dt1.Month - dt2.Month
For a clearer understanding: you do not want to compare two dates (or DateTimes) but two TimeSpans. Namely the difference in time between now and the date you supplied - and the a time span of 12 months.
String d = "26/06/10";
DateTime dt = DateTime.ParseExact(d, "dd/MM/yy", CultureInfo.InvariantCulture);
TimeSpan deltaTimeSpan = dt - DateTime.Now; // get the time difference between now and the time given
TimeSpan twelveMonths = new TimeSpan(365,0,0,0); // get a time span of 12 months
// round the amount of days down and always supply a positive number of days
int deltaTime = Convert.ToInt32(Math.Abs(Math.Floor(deltaTimeSpan.TotalDays)));
if (twelveMonths.TotalDays > deltaTime)
{
Console.WriteLine(string.Format("It is less than 12 months ({0} days).", deltaTime));
}
else if (twelveMonths.TotalDays < deltaTime)
{
Console.WriteLine(string.Format("It is more than 12 months ({0} days).", deltaTime));
}
else
{
Console.WriteLine(string.Format("The difference in time is exactly 12 months. ({0} days).", deltaTime);
}
Take note that this example certainly does not take in account leap years. The code does take in account weather the year to compare with lies in the past or the future (by converting the TimeSpan into a positive value and comparing against that one).
Adjusting the above code to do the same for two weeks or any other time span should be simple enough. Just change the TimeSpan I named "twelveMonths".
DateTime date1 = DateTime.Now.AddMonths(-12)
if(DateTime.Compare(dt, date1 )
{
//provided date is within 12 months
}
else
{
//provided date is after 12 months
}
Related
I got here a scenario where I input an information but the code does does not work. What happen is when I input 12/11/2015, the Address2Panel shows. Which is wrong because there no more date that I can input because Person A is born in 12/11/2015. The logic should Enter addresses for the past 5 years. But it goes wrong if the Birthdate gap is not lesser the 5 years from the current date.
Person A Birthday = 12/11/2015
Person A StartLiving = 12/11/2015 because its the day he/she was born.
Should not display Address2Panel
int CurrentDateInMonths = (((DateTime.Today.Year) * 12) + (DateTime.Today.Month));
static int AlienMonthsAtCurrentAddress = 0;
DateTime myDateTime;
//LivedHere = 12/11/2015
myDateTime = DateTime.Parse(LivedHere.Text);
AlienMonthsAtCurrentAddress = (CurrentDateInMonths - (((Convert.ToInt16(myDateTime.Year)) * 12) + Convert.ToInt16(myDateTime.Month)));
if (AlienMonthsAtCurrentAddress < 60)
{
Address2Panel.Visible = true;//shows the Address2Panel
}
else
{
ClearAddress2Panel();//hides also the Address2Panel
}
Any suggestion how should I improve my formula and date time manipulation?
no need to convert date into months, subtract dates using DateTime.Subtract method :
From MSDN, DateTime.Subtract Method subtracts the specified date and time from this instance.It returns a TimeSpan object which has a property Days
static int AlienMonthsAtCurrentAddress = 0;
try
{
DateTime myDateTime;
myDateTime = DateTime.Parse(LivedHere.Text);
// If you don't wish to subtract from today's date use required date in place of DateTime.Now
TimeSpan span = DateTime.Now.Subtract ( myDateTime );
if (span.Days < 60)
{
Address2Panel.Visible = true;//shows the Address2Panel
}
else
{
ClearAddress2Panel();//hides also the Address2Panel
}
}
catch { }
You could check years, months and days with a separately logic, and then get them all together:
DateTime date = new DateTime(2015,11,12)
DateTime input = getDate()
int years = input.Year - date.Year - 1
years += If(input.Month > date.Month, 1, 0)
years += If(input.Month = date.Month AndAlso input.Day >= date.Day, 1, 0)
This will output the exact number of years between two days (truncating the resulting integer). You'll just have to compare it to 5, in your case
I have 2 dates, a start (1/1/15) an end (31/12/16)
I need to calculate an amount per day from a total amount (20,000) and a annual amount based on 365 days,
I'm using Timespan to get the days between start and end dates, but in this case it returns 731 (365 + 366) as 2006 is a leap year,
but what I need is to get 730 without the leap day, is there any way of doing this
Thanks
Aj
Perhaps there is a more efficient approach but this works as expected:
public static int DaysDiffMinusLeapYears(DateTime dt1, DateTime dt2)
{
DateTime startDate = dt1 <= dt2 ? dt1.Date : dt2.Date;
DateTime endDate = dt1 <= dt2 ? dt2.Date : dt1.Date;
int days = (endDate - startDate).Days + 1;
int daysDiff = Enumerable.Range(0, days)
.Select(d => startDate.AddDays(d))
.Count(day => day.Day != 29 || day.Month != 2);
return daysDiff;
}
Your sample:
int days = DaysDiffMinusLeapYears(new DateTime(15, 1, 1), new DateTime(16,12,31));
Result: 730
This question already has answers here:
Calculate date from week number
(26 answers)
Closed 9 years ago.
The problem is there does not seem to be a built-in way to get a DateTime from a previously calculated "week number".
What I want to do is basically have this work for all times and all cultural calendars.
DateTime dt1 = new DateTime.Now;
int week = cal.GetWeekOfYear(dt);
DateTime dt2 = GetDateTimeFromYearAndWeek(dt.Year, week);
if (dt1 < dt2 || dt2 > dt2.AddDays(7.0))
{
throw new Exception("new datetime limits do not span existing datetime;
}
I think one of the issues is that for some cultures, the cal.GetWeekOfYear(dt) call will return the correct week number for a different year from dt.Year. That means you can't use it in the call to my fictious GetDateTimeFromYearAndWeek call.
My own answer is three-fold. First, I came up with a wrapper to Calendar.GetWeekOfYear that returns the "year" of the week, since this year may not be the same as the year of the DateTime object.
public static void GetWeek(DateTime dt, CultureInfo ci, out int week, out int year)
{
year = dt.Year;
week = ci.Calendar.GetWeekOfYear(dt, ci.DateTimeFormat.CalendarWeekRule, ci.DateTimeFormat.FirstDayOfWeek);
int prevweek = ci.Calendar.GetWeekOfYear(dt.AddDays(-7.0), ci.DateTimeFormat.CalendarWeekRule, ci.DateTimeFormat.FirstDayOfWeek);
if (prevweek + 1 == week) {
// year of prevweek should be correct
year = dt.AddDays(-7.0).Year;
} else {
// stay here
year = dt.Year;
}
}
Next, here is the meat of the answer. This inverts the year and weekOfYear back into a DateTime object. Note that I used the middle of the year, because this seems to avoid the problems with the singularities of the new year (where 52 or 53 may or not wrap around to 1). I also synchronize the date by finding a date that is indeed the first day of the week, avoiding problems with negative offsets comparing two DayOfWeek values.
public static DateTime FirstDateOfWeek(int year, int weekOfYear, CultureInfo ci)
{
DateTime jul1 = new DateTime(year, 7, 1);
while (jul1.DayOfWeek != ci.DateTimeFormat.FirstDayOfWeek)
{
jul1 = jul1.AddDays(1.0);
}
int refWeek = ci.Calendar.GetWeekOfYear(jul1, ci.DateTimeFormat.CalendarWeekRule, ci.DateTimeFormat.FirstDayOfWeek);
int weekOffset = weekOfYear - refWeek;
return jul1.AddDays(7 * weekOffset );
}
And finally to all those who doubt it, here is my unit test that cycles through lots of dates and cultures to make sure it works on all of them.
public static void TestDates()
{
foreach (CultureInfo ci in CultureInfo.GetCultures(CultureTypes.AllCultures).Where((x)=>!x.IsNeutralCulture && x.Calendar.AlgorithmType == CalendarAlgorithmType.SolarCalendar))
{
for (int year = 2010; year < 2040; year++)
{
// first try a bunch of hours in this year
// convert from date -> week -> date
for (int hour = 0; hour < 356 * 24; hour+= 6)
{
DateTime dt = new DateTime(year, 1, 1).AddHours(hour);
int ww;
int wyear;
Gener8.SerialNumber.GetWeek(dt, ci, out ww, out wyear);
if (wyear != year)
{
//Console.WriteLine("{0} warning: {1} {2} {3}", ci.Name, dt, year, wyear);
}
DateTime dt1 = Gener8.SerialNumber.FirstDateOfWeek(wyear, ww, ci);
DateTime dt2 = Gener8.SerialNumber.FirstDateOfWeek(wyear, ww, ci).AddDays(7.0);
if (dt < dt1 || dt > dt2)
{
Console.WriteLine("{3} Bad date {0} not between {1} and {2}", dt, dt1, dt2, ci.Name);
}
}
// next try a bunch of weeks in this year
// convert from week -> date -> week
for (int week = 1; week < 54; week++)
{
DateTime dt0 = FirstDateOfWeek(year, week, ci);
int ww0;
int wyear0;
GetWeek(dt0, ci, out ww0, out wyear0);
DateTime dt1 = dt0.AddDays(6.9);
int ww1;
int wyear1;
GetWeek(dt1, ci, out ww1, out wyear1);
if ((dt0.Year == year && ww0 != week) ||
(dt1.Year == year && ww1 != week))
{
Console.WriteLine("{4} Bad date {0} ww0={1} ww1={2}, week={3}", dt0, ww0, ww1, week, ci.Name);
}
}
}
}
}
I see that this question has been answered for Java, JavaScript, and PHP, but not C#. So, how might one calculate the number of days between two dates in C#?
Assuming StartDate and EndDate are of type DateTime:
(EndDate - StartDate).TotalDays
The top answer is correct, however if you would like only WHOLE days as an int and are happy to forgo the time component of the date then consider:
(EndDate.Date - StartDate.Date).Days
Again assuming StartDate and EndDate are of type DateTime.
Use TimeSpan object which is the result of date substraction:
DateTime d1;
DateTime d2;
return (d1 - d2).TotalDays;
I think this will do what you want:
DateTime d1 = DateTime.Now;
DateTime d2 = DateTime.Now.AddDays(-1);
TimeSpan t = d1 - d2;
double NrOfDays = t.TotalDays;
DateTime xmas = new DateTime(2009, 12, 25);
double daysUntilChristmas = xmas.Subtract(DateTime.Today).TotalDays;
// Difference in days, hours, and minutes.
TimeSpan ts = EndDate - StartDate;
// Difference in days.
int differenceInDays = ts.Days; // This is in int
double differenceInDays= ts.TotalDays; // This is in double
// Difference in Hours.
int differenceInHours = ts.Hours; // This is in int
double differenceInHours= ts.TotalHours; // This is in double
// Difference in Minutes.
int differenceInMinutes = ts.Minutes; // This is in int
double differenceInMinutes= ts.TotalMinutes; // This is in double
You can also get the difference in seconds, milliseconds and ticks.
In case someone wants numer of whole days as a double (a, b of type DateTime):
(a.Date - b.Date).TotalDays
There often is a debate on time (hours) when it comes to counting days between two dates. The responses to the question and their comments show no exception.
Considering StartDate and EndDate are of type DateTime: if performance is not a concern, I would strongly recommend documenting your calculation through intermediate conversions. For example, (EndDate - StartDate).Days is unintuitive because rounding will depend on the hour component of StartDate and EndDate.
If you want the duration in days to include fractions of days, then as already suggested
use (EndDate - StartDate).TotalDays.
If you want the duration to reflect
the distance between two days, then use (EndDate.Date - StartDate.Date).Days
If you want the duration to reflect the
duration between the morning of the start date, and the evening of
the end date (what you typically see in project management software), then use
(EndDate.Date - StartDate.Date).Days + 1
You can try this
EndDate.Date.Subtract(DateTime.Now.Date).Days
Using a timespan would solve the problems as it has many attributes:
DateTime strt_date = DateTime.Now;
DateTime end_date = Convert.ToDateTime("10/1/2017 23:59:59");
//DateTime add_days = end_date.AddDays(1);
TimeSpan nod = (end_date - strt_date);
Console.WriteLine(strt_date + "" + end_date + "" + "" + nod.TotalHours + "");
Console.ReadKey();
For a and b as two DateTime types:
DateTime d = DateTime.Now;
DateTime c = DateTime.Now;
c = d.AddDays(145);
string cc;
Console.WriteLine(d);
Console.WriteLine(c);
var t = (c - d).Days;
Console.WriteLine(t);
cc = Console.ReadLine();
For beginners like me that will stumble upon this tiny problem, in a simple line, with sample conversion to int:
int totalDays = Convert.ToInt32((DateTime.UtcNow.Date - myDateTime.Date).TotalDays);
This calculates the total days from today (DateTime.UtcNow.Date) to a desired date (myDateTime.Date).
If myDateTime is yesterday, or older date than today, this will give a positive (+) integer result.
On the other side, if the myDateTime is tomorrow or on the future date, this will give a negative (-) integer result due to rules of addition.
Happy coding! ^_^
First declare a class that will return later:
public void date()
{
Datetime startdate;
Datetime enddate;
Timespan remaindate;
startdate = DateTime.Parse(txtstartdate.Text).Date;
enddate = DateTime.Parse(txtenddate.Text).Date;
remaindate = enddate - startdate;
if (remaindate != null)
{
lblmsg.Text = "you have left with " + remaindate.TotalDays + "days.";
}
else
{
lblmsg.Text = "correct your code again.";
}
}
protected void btncal_Click(object sender, EventArgs e)
{
date();
}
Use a button control to call the above class. Here is an example:
You can use the code below:
int DateDifInSecond = EndDate.Subtract(StartDate).TotalSeconds
Get the difference between the two dates and then get the days from:
int total_days = (EndDate - StartDate).TotalDays
try this truly worked Get actual days diff. date format is "dd/MM/yyyy"
string[] d1 = txtFromDate.Values.Split('/');
string[] d2 = txtToDate.Values.Split('/');
DateTime FrmDt = new DateTime(Convert.ToInt32(d1[2]), Convert.ToInt32(d1[1]), Convert.ToInt32(d1[0]));
DateTime ToDt = new DateTime(Convert.ToInt32(d2[2]), Convert.ToInt32(d2[1]), Convert.ToInt32(d2[0]));
TimeSpan TDiff = ToDt.Subtract(FrmDt);
String DaysDiff = TDiff.TotalDays.ToString();
protected void Calendar1_SelectionChanged(object sender, EventArgs e)
{
DateTime d = Calendar1.SelectedDate;
// int a;
TextBox2.Text = d.ToShortDateString();
string s = Convert.ToDateTime(TextBox2.Text).ToShortDateString();
string s1 = Convert.ToDateTime(Label7.Text).ToShortDateString();
DateTime dt = Convert.ToDateTime(s).Date;
DateTime dt1 = Convert.ToDateTime(s1).Date;
if (dt <= dt1)
{
Response.Write("<script>alert(' Not a valid Date to extend warranty')</script>");
}
else
{
string diff = dt.Subtract(dt1).ToString();
Response.Write(diff);
Label18.Text = diff;
Session["diff"] = Label18.Text;
}
}
Given two DateTimes in C#, how can I display the difference in years and months?
I can do basic arithmatic on the timespan that comes from a simple subtraction but this won't take into account the differing lengths of months, leap years etc.
Thanks for any help.
Because the underlying representation is measured in 100-nanosecond ticks since 12:00 midnight, January 1, 1 A.D., a subtraction will handle leap years etc. quite correctly:
DateTime date1 = ...
DateTime date2 = ...
// date2 must be after date1
TimeSpan difference = date2.Subtract(date1);
DateTime age=new DateTime(tsAge.Ticks);
int years = age.Years - 1;
int months = age.Month - 1;
Console.WriteLine("{0}Y, {1}M", years, months);
FWIW here's what i've ended up with
DateTime servicelength = new DateTime(DateTime.Now.Subtract(employee.StartDate).Ticks);
LengthOfService.Text = String.Format("{0}Y {1}M", servicelength.Year - 1, servicelength.Month - 1);
You could try this:
DateTime date1 = new DateTime(1954, 7, 30);
DateTime today = DateTime.Now;
TimeSpan span = today - date1;
DateTime age = DateTime.MinValue + span;
int years = age.Year - 1;
int months = age.Month - 1;
int days = age.Day - 1;
Console.WriteLine("years: {0}, months: {1}, days: {2}", years, months, days);
Different length of month? Which month should it take? the time span is not bound to a certain year or month in the year. You can only count the days between two dates:
Timspan span = date2 - date1;
Console.Writeline("Days between date1 and date2: {0}", span.Days);
Counting from DateTime.MinValue just take the year 0001 as start and counts the months from January. I don't think that this is of practical use.
EDIT:
Had another idea. You can count the month since date1:
// primitive, inelegant, but should work if date1 < date2
int years = date2.Year - date1.Year;
int month = date2.Month - date1.Month;
if (month < 0)
{
years -= 1;
month += 12;
}
Console.Writeline("{0}Y {1}M", years, month);
The problem here is that you just ignore the days. After all it's not a good solution.
Given it is UTC DateTime in this example
(you can also define any different date for "now")
DateTime now = DateTime.UtcNow;
DateTime birthdate = new DateTime (1976,11,12);
DateTime age = now.AddYears(-birthdate.Year).AddMonths(-birthdate.Month).AddDays(-birthdate.Day);
You can go on with hours, minutes , seconds etc. if defined in birthdate
now you can extract the years months days from age
int years = age.Year
int month = age.Month
and so on