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Format a date using a specific format [duplicate]

This question already has answers here:
Format date in C#
(7 answers)
How to format a date in C# by example?
(5 answers)
Closed 1 year ago.
I have 31 juli 2021 (norwegian date formatting), and adding 14 days to it, which gives me 14.08.2021.
I would like for the return date to be in the same format: 14 august 2021.
This is my current code:
int yearInt = Convert.ToInt32(year);
int monthInt = Convert.ToInt32(month);
int lastDayOfMonth = DateTime.DaysInMonth(yearInt, monthInt);
DateTime today = DateTime.Now;
DateTime invoiceDate = new(yearInt, monthInt, lastDayOfMonth);
DateTime invoiceDatePlus14 = invoiceDate.AddDays(14);
string rsvpBy_monthIsInt = invoiceDayPlus14.ToShortDateString();
I know how to get the month name off of the its corresponding int value:
static string getMonthName(int month) {
return CultureInfo.CreateSpecificCulture("no").DateTimeFormat.GetMonthName(month);
}
But how can I do the same to monthInt without re-factoring my whole approach?
If I need to - I need to, if so, how could I?

You may want to try this:
string rsvpBy_monthIsInt = invoiceDayPlus14.ToString("dd MMMM yyyy");

Date month and year calculation [duplicate]

This question already has answers here:
How do I get the time difference between two DateTime objects using C#?
(9 answers)
Closed 7 years ago.
I have two dates of the form:
Start Date: 2007-03-24
End Date: 2009-06-26
Now I need to find the difference between these two in the following form:
2 years, 3 months and 2 days
How can I do this in c# windows form?

You need to use TimeSpan to get difference..
class Program
{
static void Main(string[] args)
{
string StartDate = "2007-03-24";
string EndDate = "2009-06-26";
System.DateTime firstDate = DateTime.ParseExact(StartDate, "yyyy-MM-dd", System.Globalization.CultureInfo.InvariantCulture);
System.DateTime secondDate = DateTime.ParseExact(EndDate, "yyyy-MM-dd", System.Globalization.CultureInfo.InvariantCulture);
System.TimeSpan diff = secondDate.Subtract(firstDate);
var totalDays = (diff).TotalDays;
var totalYears = Math.Truncate(totalDays / 365);
var totalMonths = Math.Truncate((totalDays % 365) / 30);
var remainingDays = Math.Truncate((totalDays % 365) % 30);
Console.WriteLine("Estimated duration is {0} year(s), {1} month(s) and {2} day(s)", totalYears, totalMonths, remainingDays);
Console.ReadLine();
}
}

.net already provide TimeSpan class to show differences between two datetime value.some properties of TimeSpan class show years,month and day interval seperately

Operate between datetimepickers [duplicate]

This question already has answers here:
How to subtract a datetime from another datetime?
(7 answers)
Closed 9 years ago.
I am trying to get the difference between two datetimepickers.
For example:
Between X date and Y date, have been past X days, Y months and Z years.
So, if I'd put in the first datetimepicker my birth date and in the second the day of today, I would my exact age, for example: "20 days, 3 months and 26 years".
I tried a few codes, but the results are not correct.
Thanks in advance.
The code is:
string age = "Tu age es de:\n";
age = age + ((Math.Abs(DateTime.Today.Day - dtpage.Value.Day)).ToString()) + " days, ";
age = age + ((Math.Abs(DateTime.Today.Month - dtpage.Value.Month)).ToString()) + " months";
age = age + " y " + ((Math.Abs(DateTime.Today.Year - dtpage.Value.Year)).ToString()) + " years";
MessageBox.Show(age);
EDIT: Solved in C# calculate accurate age

Please show the code if this answer is not sufficient, but if you're talking about DateTime objects, just use the Subtract method.

Try This:
DateTime birthdayDate = DateTime.Now; //get the date from datetimepicker
var dateTimeResult = DateTime.Now.Subtract(birthdayDate);

I think Datediff will accomplish this.
Edit - here:
string diff = DateAndTime.DateDiff(DateInterval.Second, DateTimePicker1.Value, DateTimePicker2.Value);
Interaction.MsgBox(diff);
Now just format the seconds.

I think you might have to write a couple of your own lines of code, which is not too hard if you look at your classes. Here is a simple example, you may need to check for a negative month value and if so add 12 to it, since you would be carrying a year over.
DateTime d = DateTime.Now;
DateTime d2 = DateTime.Now.AddMinutes(-28938923);
int years = d.Year - d2.Year;
int months = d.Month - d2.Month;
int days = d.Day - d2.Day;
if (days < 0)
{
// borrow a month
months--;
// use your brain power to pick the correct month. I have not thought this step out.
days += DateTime.DaysInMonth(d.Month);
}
if (months < 0)
{
// borrow a year
years--;
months += 12;
}

Date compare like strtotime in C#? [duplicate]

This question already has answers here:
strtotime equivalent in .NET
(6 answers)
Closed 9 years ago.
Have big problem I don´t know how to compare date in C# like PHP.
I want to convert this code in to C#:
$now = strtotime ("now");
$then = strtotime ("$date");
$difference = $now - $then ;
$num = ($difference/86400)/7;
$weeks = intval($num);
Which function should I use?
This link can´t find a matching function like strtotime.
Please help me to convert the code to C#.
Thanks in advance.

var now = DateTime.Now.TimeOfDay;
DateTime dt = DateTime.Parse(yourDateTime);
var then = dt.ToString("HH:mm");
// here you can do rest of the calculations
basically
dt.ToString("HH:mm"); // 24 hour clock
dt.ToString("hh:mm tt"); // 12 hour clock
Hope it will give you better understanding

I think you might be looking for something like below:
DateTime sDateTimeNow = DateTime.Now;//Gets the date time from the server now
DateTime sIn30Seconds = DateTime.Now.AddSeconds(30);//Gets date time and adds 30 Seconds
DateTime sIn30Hours = DateTime.Now.AddHours(30);//Gets date time and adds 30 hours
DateTime sIn30Days = DateTime.Now.AddDays(30);//Gets date time and adds 30 days
double dTotalDays = (sIn30Days - sDateTimeNow).TotalDays;
double dTotalHours = (sIn30Hours - sDateTimeNow).TotalHours;
double dTotalSeconds = (sIn30Seconds - sDateTimeNow).TotalSeconds;

Calculate date difference in months [closed]

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center.
Closed 9 years ago.
I have a field returning a year and month value. For example, 20119 (2011 is year and 9 is for September). How could I compare that to the current year and month to get the difference in months? For example, in the same format the current year and month would be 20135, so the value I would be looking for would be 20. 20135 minus 20 months would be 20119. Not sure how to construct the formula to dynamically calculate the difference in months using date functions, perhaps.

Try this
DateTime x1 = DateTime.ParseExact("20119", "yyyyM", CultureInfo.InvariantCulture);
DateTime x2 = DateTime.ParseExact("20135", "yyyyM", CultureInfo.InvariantCulture);
int months = Math.Abs((x2.Month - x1.Month) + 12 * (x2.Year - x1.Year));

First I am assuming that by your question:
Single date months will have one digit
The value of the Year+Month is a string (if it is an int, throw a ToString() on the in value in the code below)
Your value thus will be 5-6 digits in length. You can perform the code below in less lines, but forgive my verbose answer - I will add extra code to make this more clear:
We can get the current date only as month year by getting using Date.Now
// Just want the month/year
DateTime currentDate = new DateTime(DateTime.Now.Year, DateTime.Now.Month, 1);
Now we can get your date for to test against the current year/month using a substring method (remember my assumption that we are dealing with a string value, and to convert ToString() if not).
// breaking out test date to year/month portions and saving as a new date time
string testDateValue = "20119";
int testDateYear = Convert.ToInt32(testDateValue.Substring(0, 4));
int testDateMonth = Convert.ToInt32(testDateValue.Substring(4));
DateTime testDate = new DateTime(testDateYear, testDateMonth, 1);
Now lets get the difference:
// get month dif - remove abs() if want negative if test date in future
int numberOfMonths = Math.Abs(((currentDate.Year - testDate.Year) * 12) +
(currentDate.Month - testDate.Month));
Now - if you want to compare 2 days in the yyyym format instead of using current date, just do the year/month conversion listed above and then perform the month dif formula on that.

Why not multiply the year by number of months in a year for each date field and then return the difference?

You can use the class DateDiff class from the Time Period Library for .NET, to calculate the months:
// ----------------------------------------------------------------------
public void CalcMonths( DateTime epoch )
{
DateDiff dateDiff = new DateDiff( DateTime.Now, epoch );
Console.WriteLine( "{0} months", dateDiff.Months );
// > 1 Year 4 Months 12 Days 12 Hours ago
} // CalcMonths

You can basically split the string.
int a = 201410;
int b= 20139;
int year1 = int.Parse(a.ToString().Substring(0,4));
int year2 = int.Parse(b.ToString().Substring(0,4));
int month1 = int.Parse(a.ToString().Substring(4));
int month2 = int.Parse(b.ToString().Substring(4));
//now construct a date for each
DateTime date1 = new DateTime(year1, month1, 1);
DateTime date2 = new DateTime(year2, month2, 1);
//then subtract them and make it months
int numberOfMonths = ((date1.Year - date2.Year) * 12) + date1.Month - date2.Month;

This is a code snippet from the solution posted on MSDN (link):
DateTime oldDate = new DateTime(2002,7,15);
DateTime newDate = DateTime.Now;
// Difference in days, hours, and minutes.
TimeSpan ts = newDate - oldDate;
// Difference in days.
int differenceInDays = ts.Days;
Should work for years/months as well (something like the following):
int differenceInMonths = (ts.Years *12 + ts.Months);
Hope this will help.
Rgds, AB