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Parse date format as mm-yy from mm/yy [closed]

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I wanna convert MM/YY formatted string date to mm-yy DateTime. And set as the value for rad masked edit box. But it returns to me
"String was not recognized as a valid DateTime."
I tried with
DateTime dt = DateTime.ParseExact("11/17", "MMyy", CultureInfo.InvariantCulture);
for eg, I want to convert 03/16 and set value of radmasked edit box masked as MMyy as 03-16

Why do you expect this to work at all?
DateTime dt = DateTime.ParseExact("11/17", "MMyy", CultureInfo.InvariantCulture);
You get a string 11/17 and try to parse it with a format that doesn't contain any delimiters.
This works:
DateTime dt = DateTime.ParseExact("11/17", "MM/yy", CultureInfo.InvariantCulture);
If you want to convert it to a string with this format: MMyy:
string result = dt.ToString("MMyy", CultureInfo.InvariantCulture);
Since it's not clear, if you want this instead: MM-yy
string result = dt.ToString("MM-yy", CultureInfo.InvariantCulture);
It's working for 11/17,12/17. but not in the case of 3/12 etc i.e when
a month is a single digit.
You haven't mentioned that it's possible that the month has a single digit, however:
DateTime dt = DateTime.ParseExact("3/17", "M/yy", CultureInfo.InvariantCulture);

This will work for you.
DateTime dt = DateTime.ParseExact("11/17", "MM/yy", CultureInfo.InvariantCulture);
Then you can convert it to your desired format
string formattedDate = dt.ToString("MM-yy");

In case you want to change delimeter '/' into '-' only, i.e. if you have no need in DateTime temporary value, you can just Replace:
string source = "11/17";
// 11-17: changing '/' to '-'
string result = source.Replace('/', '-');

How to convert DateTimeOffset ToString("o") offset set to be 00 [closed]

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DateTimeOffset.Now = {2/22/2018 10:32:50 AM -06:00} been converted to
xmlformatTime = "2018-02-22T10:33:18.2670639-06:00", , in the format need to remove and expected o/p as 2018-02-22T10:33:18.00-06:00.
18.2670639 needs to change as 18.00
DateTimeOffset PassDate = DateTimeOffset.Now;
int minutes = PassDate.Minute;
int seconds = PassDate.Second;
var offset = PassDate.Offset;
var xmlformatTime = PassDate.ToString("o");
Console.WriteLine(xmlformatTime)
when tried with below option.
var xmlformatTime = PassDate.ToString("'MM'-'dd'T'HH':'mm':'ss'.00'K");

From MSDN:
The "O" or "o" standard format specifier corresponds to the "yyyy'-'MM'-'dd'T'HH':'mm':'ss'.'fffffffzzz" custom format string for DateTimeOffset values
So use
var xmlformatTime = PassDate.ToString("yyyy'-'MM'-'dd'T'HH':'mm':'ss'.00'zzz");
instead to change the milliseconds to zeros.

Regex between two times [closed]

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I have a file with a few million lines in them.
Every line starts like this:
2016/04/05 11:20:43.293
I would like a regex (or other option?) to get all the lines that fall between two times. (for example between 11:20 and 11:25)
Also, if it's possible to match one or more words in those lines, that would be helpfull as well. However, perhaps a regex isn't the best way to go then?

You could use DateTime.TryParseExact and File.ReadLines with this LINQ query:
string format = "yyyy/MM/dd HH:mm:ss.fff";
DateTime dt;
var relevantLines = File.ReadLines(path)
.Where(l => l.Length >= format.Length
&& DateTime.TryParseExact(l.Substring(0, format.Length), format, DateTimeFormatInfo.InvariantInfo, DateTimeStyles.None, out dt)
&& dt.TimeOfDay >= start && dt.TimeOfDay <= end);

First you have to use a Regex:
Regex TimePattern = new Regex("\\d{2}:\\d{2}.\\d{3}");
Parse the matches to datetime and check if the time is valid:
foreach (Match M in TimePattern.Matches(FILECONTENT))
{
DateTime Dt = Convert.ToDateTime(M.groups[1]));
//Now you can check if the time "Dt" is between 11:20 and 11:25
}
To compare the time you could use (like described in Is there BETWEEN DateTime in C# just like SQL does?):
public static bool Between(DateTime input, DateTime date1, DateTime date2)
{
return (input > date1 && input < date2);
}

DateTime to int [closed]

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How to covert DateTime to int
DateTime now = DateTime.Now;
int va = now.Year;
// error here
int vd = int.Parse(mYear.Value.ToShortDateString());
result = Convert.ToString(va - vd);
Input string was not in a correct format

Assuming mYear is of Type DateTime - Just do it like you did with now:
int vd = mYear.Year;
If it's a string like "2014", use something like:
DateTime.ParseExact(mYear, "yyyy", System.Globalization.CultureInfo.InvariantCulture, System.Globalization.DateTimeStyles.None);

Not sure what Parse is going to do with escape chars.
// The example displays the following output:
// Displaying short date for en-US culture:
// 6/1/2009 (Short Date String)
// 6/1/2009 ('d' standard format specifier)
# ElGavilan commented to the same effect while I was posting.

addition of two month and year in asp.net with c# [closed]

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addition of two month and year in asp.net with c#.
if i select any one Month/year: like march/2014 and add(+) 12 month,
so it should be give the February/2014.
In this we can see Loan Period is: 12 (month) and below we can see loan start from month: 07(july/2014) so end of the load should be 06/2015. and the both month are in textbox it means they are string.

DateTime dt = new DateTime(2013, 1, 1);
dt.AddYear(1);
dt.AddMonths(2);
//Date is 2014, 3 (March), 1
Alternatively if you wish to substrat years and months you can use:
dt.AddYear(-1);
dt.AddMonths(-1);
//Date is 2013, 2 (February),1

Here you will not get 02/2015 if you add 12 months in 03/2014. You will get 03/2015 in result as shown below.
var inputString = "march/2014";
DateTime dt = DateTime.ParseExact(inputString, "MMMM/yyyy", CultureInfo.InvariantCulture);
var result = dt.AddMonths(12).ToString("MMMM/yyyy");
Will result in => "march/2015"

It seems that yous should add -1, not 12 months (if you want to get February from March):
String fromDate = "march/2013";
// result == "February/2013"
String result = DateTime
.ParseExact(fromDate, "MMMM/yyyy", CultureInfo.InvariantCulture)
.AddMonths(-1)
.ToString("MMMM/yyyy", CultureInfo.InvariantCulture);
In case that you want to add a year and two months (and so your example is incorrect)
String fromDate = "march/2013";
// result == "May/2014"
String result = DateTime
.ParseExact(fromDate, "MMMM/yyyy", CultureInfo.InvariantCulture)
.AddYears(1)
.AddMonths(2)
.ToString("MMMM/yyyy", CultureInfo.InvariantCulture);