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Datetime value to string by replacing c# [duplicate]

This question already has answers here:
extract the date part from DateTime in C# [duplicate]
(5 answers)
Closed 8 years ago.
I have a datetime value below,
23/07/2014 04:15:00
How can i get date as below string value
23/07/2014
How can i get hour as below string value
04:15 AM/PM (depends hour time)
Any help will be appreciated.
Thanks.

I'd parse the string to DateTime first to avoid string manipulation.
var str = "23/07/2014 04:15:00";
var dt = DateTime.ParseExact(str, "dd/MM/yyyy HH:mm:ss", CultureInfo.InvariantCulture);
var date = dt.ToString("dd/MM/yyyy", CultureInfo.InvariantCulture);//23/07/2014
var time = dt.ToString("hh:mm tt", CultureInfo.InvariantCulture);//04:15 AM
If you have the value as DateTime you can skip ParseExact part.

I'm not sure if you really use a DateTime instead of a string, but you should. If not, you can use DateTime.Parse/DateTime.TryParseExact to get a DateTime from a string.
DateTime has a method ToShortDateString
string dateOnly = dt.ToShortDateString();
// or to force / as separator even if current culture has different separator
dateOnly = dt.ToString("d", CultureInfo.InvariantCulture);
// hour+minute and AM/PM designator:
string hour = DateTime.Now.ToString("hh:mm tt", CultureInfo.InvariantCulture);

I strongly feel like taking a risk to answer your question but.. anyway.
How can i get date as below string value
DateTime dt = new DateTime(2014, 7, 23, 4, 15, 0);
Console.WriteLine(dt.ToString(#"dd\/MM\/yyyy")); // 23/07/2014
I escaped / character because it has a special meaning in custom date and time format strings. It means as; replace me with the current culture date separator. Take a look "/" Custom Format Specifier for more information.
How can i get hour as below string value
Console.WriteLine(dt.ToString("HH:mm tt", CultureInfo.InvariantCulture));
Output will be;
04:15 AM

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

TimeSpan adding minutes to zero hour [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 10 years ago.
I'm adding time span with interval size(suppose one minute) in a loop and whenever it gets 23:59 and at this point I'm trying to add one minute, it giving me result 1.00:00:00:00 something like this. How can i get continuous adding intervals when it comes 23:59:00 like
00:00:00
00:01:00
00:02:00
Thanks.

Either
When displaying your timespan, ignore the days part:
string toDisplay = yourTimeSpan.ToString("hh:mm:ss");
After incrementing your timespan, subtract a day if it is a day or longer:
if (yourTimeSpan.Days == 1)
yourTimeSpan = yourTimeSpan.Subtract(TimeSpan.FromDays(1));
// or Wonko the Sane's improved version
if (yourTimeSpan.Days > 0) yourTimeSpan = new TimeSpan();

Whenever your TimeSpan gets over one day, it will format itself in ToString() adding that day to returned string. You could either format ToString() or substract one day after you accumulate it. If you would like your TimeSpan not to go over one day, check this code:
TimeSpan ts = new TimeSpan();
DateTime dt = new DateTime();
TimeSpan day = dt.AddDays(1) - dt;
TimeSpan minute = dt.AddMinutes(1) - dt;
for (int i = 0; i < 20000; i++)
{
ts = ts.Add(minute);
if (ts.TotalDays > 1)
{
ts = ts.Subtract(day);
}
}

I assume you're printing out the value of your TimeSpan just using the standard toString() method? this will yield the TimeSpan in a "human formatted" time representation, e.g. 25 hours will be 1 day and 1 hour.
If you want to get the total number of minutes, for example use the TimeSpan.TotalMinutes proprety

You want it to loop back to 00:00 after reaching 23:59?
In your loop, or wherever you're trying to achieve this, check if the Days component is bigger than 0, and if so, subtract one day.
Seems too simple an aswer to be right... what do you really look for?

After your TimeSpan reaches more than a day, you'll get that form of output. If you still want to show it in hour form, try something like
String.format({0}:{1}:{2}, span.Days*24 + span.Hours, span.Minutes, span.Seconds)

extract the date part from DateTime in C# [duplicate]

This question already has answers here:
How to remove time portion of date in C# in DateTime object only?
(43 answers)
Closed 9 years ago.
The line of code DateTime d = DateTime.Today; results in 10/12/2011 12:00:00 AM. How can I get only the date part.I need to ignore the time part when I compare two dates.

DateTime is a DataType which is used to store both Date and Time. But it provides Properties to get the Date Part.
You can get the Date part from Date Property.
http://msdn.microsoft.com/en-us/library/system.datetime.date.aspx
DateTime date1 = new DateTime(2008, 6, 1, 7, 47, 0);
Console.WriteLine(date1.ToString());
// Get date-only portion of date, without its time.
DateTime dateOnly = date1.Date;
// Display date using short date string.
Console.WriteLine(dateOnly.ToString("d"));
// Display date using 24-hour clock.
Console.WriteLine(dateOnly.ToString("g"));
Console.WriteLine(dateOnly.ToString("MM/dd/yyyy HH:mm"));
// The example displays the following output to the console:
// 6/1/2008 7:47:00 AM
// 6/1/2008
// 6/1/2008 12:00 AM
// 06/01/2008 00:00

There is no way to "discard" the time component.
DateTime.Today is the same as:
DateTime d = DateTime.Now.Date;
If you only want to display only the date portion, simply do that - use ToString with the format string you need.
For example, using the standard format string "D" (long date format specifier):
d.ToString("D");

When comparing only the date of the datatimes, use the Date property. So this should work fine for you
datetime1.Date == datetime2.Date

DateTime d = DateTime.Today.Date;
Console.WriteLine(d.ToShortDateString()); // outputs just date
if you want to compare dates, ignoring the time part, make an use of DateTime.Year and DateTime.DayOfYear properties.
code snippet
DateTime d1 = DateTime.Today;
DateTime d2 = DateTime.Today.AddDays(3);
if (d1.Year < d2.Year)
Console.WriteLine("d1 < d2");
else
if (d1.DayOfYear < d2.DayOfYear)
Console.WriteLine("d1 < d2");

you can use a formatstring
DateTime time = DateTime.Now;
String format = "MMM ddd d HH:mm yyyy";
Console.WriteLine(time.ToString(format));

How to set only time part of a DateTime variable in C# [duplicate]

This question already has answers here:
How to change time in DateTime?
(29 answers)
Closed 9 years ago.
I have a DateTime variable:
DateTime date = DateTime.Now;
I want to change the time part of a DateTime variable. But when I tried to access time part (hh:mm:ss) these fields are readonly.
Can't I set these properties?

Use the constructor that allows you to specify the year, month, day, hours, minutes, and seconds:
var dateNow = DateTime.Now;
var date = new DateTime(dateNow.Year, dateNow.Month, dateNow.Day, 4, 5, 6);

you can't change the DateTime object, it's immutable. However, you can set it to a new value, for example:
var newDate = oldDate.Date + new TimeSpan(11, 30, 55);

date = new DateTime(date.year, date.month, date.day, HH, MM, SS);

I'm not sure exactly what you're trying to do but
you can set the date/time to exactly what you want in a number of ways...
You can specify 12/25/2010 4:58 PM by using
DateTime myDate = Convert.ToDateTime("2010-12-25 16:58:00");
OR if you have an existing datetime construct , say 12/25/2010 (and any random time) and you want to set it to 12/25/2010 4:58 PM, you could do so like this:
DateTime myDate = ExistingTime.Date.AddHours(16).AddMinutes(58);
The ExistingTime.Date will be 12/25 at midnight, and you just add hours and minutes to get it to the time you want.

It isn't possible as DateTime is immutable. The same discussion is available here: How to change time in datetime?