We Keep Coding

How to convert datetime format in c#?

I want to convert the DateTime format using c#. This is my code
string date = "Thu May 20 2021 00:00:00 GMT-0700 (Pacific Daylight Time)";
var s = DateTime.ParseExact(date, "dd-MM-yyyy HH:mm:ss", null);
But this code not working the exception is 'System.FormatException: 'String was not recognized as a valid DateTime.'

The format you provide must match with the format used in the string. Hence the name ParseExact. After playing around a bit I was able to match these:
string date = "Thu May 20 2021 00:00:00 GMT-0700"
var s = DateTime.ParseExact(date, "ddd MMM dd yyyy HH:mm:ss \"GMT\"zzz", null);
You may need to manually truncate the (Pacific Daylight Time) or include it in the format as a literal (like I did with GMT here).
For more information you can work with DateTime format specifiers

Your format string means that the date value must be something like that:
string date = "20-05-2021 12:00:00";
var s = DateTime.ParseExact(date, "dd-MM-yyyy HH:mm:ss", null);
Try to use an other date value or change the date format string.
You can find a lot of good examples here:
https://learn.microsoft.com/en-us/dotnet/api/system.datetime.parseexact?view=net-5.0#System_DateTime_ParseExact_System_String_System_String_System_IFormatProvider_

How to Convert a datetime to Long Date?

Below is my code,
DateTime DateFrom_ = Convert.ToDateTime(CSO.dateFrom);
I am getting the value currently like - 29/10/2019 00:00:00
what i want is I want to convert above to this format - Tue, 29 Oct 2019
can anyone please guide me how to do this, Thank you.

Below one worked for me,
DateTime DateFrom_ = Convert.ToDateTime(CSO.dateFrom);
var convertedDate = DateFrom_.ToString("ddd', 'dd' 'MMM' 'yyyy");

You can do it easily, using DateTime.ParseExact to parse from certain format, and then use ToString with different format to represent it based on your need:
var date = DateTime.ParseExact("29/10/2019 00:00:00", "dd/MM/yyyy HH:mm:ss", CultureInfo.InvariantCulture);
date.ToString("ddd, dd MMM yyyy"); // output Tue, 29 Oct 2019
Please note, if you need culture specific long date representation, then you should use ToString("D", cultureInfo) overload. That way, your format will be aligned with the culture defined format.

I think using DateTime.ToString() with the specific format should do the work. Try this one:
date.ToString("D", CultureInfo.CreateSpecificCulture("en-US"));

As it's been mentioned in here, you want to be using "DateTime.ParseExact"
var str = "Tue, 29 Oct 2019";
var date = DateTime.ParseExact(str, "ddd, dd MMM yyyy", CultureInfo.InvariantCulture);

You may split the date and use DateTime.ParseExact.
string[] tokens = "29/10/2019 00:00:00".Split(' ');
DateTime DateFrom_ = DateTime.ParseExact(tokens[0], "dd/MM/yyyy", CultureInfo.InvariantCulture);
var dateString = DateFrom_.ToString("ddd, dd MMM yyyy");

How to parse custom string to DateTime C#?

I need to parse to following Date Aug 20 11:38:43 2017 GMT
I'm trying to use DateTime.TryParseExact but can't find the correct format.
my latest format is MMM dd hh:mm:ss yyyy
my code :
string nextUpdate; //Next Update: Aug 20 11:38:43 2017 GMT
string dateTimeFormat = "MMM dd hh:mm:ss yyyy";
DateTime crldt;
DateTime.TryParseExact(nextUpdate.Split(':')[1].Trim(), dateTimeFormat, System.Globalization.CultureInfo.InvariantCulture, System.Globalization.DateTimeStyles.None, out crldt);
when I run the code I get crldt ~ Date = {1/1/01 12:00:00 AM}
my question : what format should I use or what alternative way can I use to parse this string to DateTime
UPDATE
using suggestions from : #Sergey Berezovskiy
I've updated the code to :
string nextUpdate; // Next Update: Oct 7 06:16:18 2017 GMT
string dateTimeFormat = #"MMM dd HH:mm:ss yyyy \G\M\T";
Regex r =new Regex(".*Next Update:.*");
nextUpdate = r.Match(Crltext).Value;
DateTime crldt;
DateTime.TryParseExact(nextUpdate.Substring(nextUpdate.IndexOf(':')+1).Trim(),
dateTimeFormat, System.Globalization.CultureInfo.InvariantCulture,
System.Globalization.DateTimeStyles.AssumeUniversal, out crldt);
int intDTComp = DateTime.Compare(crldt, DT_now);
I've found a date that doesn't fit this format : Next Update: Oct 7 06:16:18 2017 GMT
what is the issue now ?
UPDATE 2
I've found the issue , but can't find a clean solution.
The issue is that the problematic date is Oct 7 ... ,
while the format is MMM dd ...
my workaround is adding another format MMM d hh:mm:ss yyyy and using it if date = {1/1/01 12:00:00 AM}
what other solution may I use in this scenario

First of all, don't forget that your string contains "GMT". You should either remove it from the string, or add to format pattern:
string nextUpdate = "Next Update: Aug 20 11:38:43 2017 GMT";
string format = #"MMM dd hh:mm:ss yyyy \G\M\T";
Next - don't split input string by : because there is another : symbols in the string. And you will get array with parts ["Next Update", " Aug 20 11", "38", "43 2017 GMT"]. Taking the second item from array gives you " Aug 20 11". Instead, you should just take substring after first : occurance:
string s = nextUpdate.Substring(nextUpdate.IndexOf(':') + 1).Trim();
And finally parse that string using your format:
IFormatProvider provider = CultureInfo.InvariantCulture;
DateTime date = DateTime.ParseExact(s, format, provider, DateTimeStyles.AssumeUniversal);
Output will depend on your time zone. E.g. for my time zone GMT+3 it will be:
8/20/2017 14:38:43

If this is your string:
"Next Update: Aug 20 11:38:43 2017 GMT"
Then when you do this:
nextUpdate.Split(':')[1].Trim()
You get this:
"Aug 20 11"
Which doesn't match your date format. I suspect you don't just want the second split value, but also all remaining split values. You can re-join them. Something like this:
string.Join(":", nextUpdate.Split(':').Skip(1)).Trim()
This would split them by the ":" character, skip the first one but keep all remaining ones, and re-join the remaining ones into another string with the ":" character again.
Note: You may also need to account for that time zone value. There are some helpful ideas on this question for how to do that.

If that's the input, I propose that you take the format exactly as the input
string nextUpdate = "Next Update: Aug 20 11:38:43 2017 GMT";
string dateTimeFormat = #"\N\e\x\t\ \U\p\d\a\t\e\:\ MMM dd hh:mm:ss yyyy\ \G\M\T";
DateTime crldt;
crldt = DateTime.ParseExact(nextUpdate, dateTimeFormat , System.Globalization.CultureInfo.InvariantCulture, System.Globalization.DateTimeStyles.None);
This way, when reading the code it's very clear what the expected format is, and you don't have code with Split() or other items that need explanation.
Also note that if you leave the colons (:) like that, they may be replaced by .NET to match the hour separator. Use \: if you always require a literal colon.
As I wrote in the comments before, note that you're ignoring the time zone.

Use following code
CultureInfo provider = CultureInfo.InvariantCulture;
DateTime givenDate = DateTime.ParseExact("Aug 20 14:38:43 2017 GMT", "MMM dd HH:mm:ss yyyy GMT", provider); // here HH is for 24 hour format . use hh for 12 hour format
string expectedDate = givenDate.ToString("dd/MM/yy hh:mm:ss tt"); // tt is for AM or PM (no need to use tt if you use hour as HH I mean 24 hour format)
Your Output will be 20/08/17 11:38:43 AM

Parse DateTime From Odd Format [duplicate]

This question already has an answer here:
Closed 10 years ago.
Possible Duplicate:
Parsing a complicated string as DateTime
I have a string date with time that I'd like to parse into a DateTime. I'm not quite sure how to tackle it because of the odd format. Help is appreciated.
Example: Mon Mar 24 13-42-30 2008

DateTime.ParseExact should do what you want:
var dateTime = DateTime.ParseExact(
"Mon Mar 24 13-42-30 2008",
"ddd MMM dd HH-mm-ss yyyy",
CultureInfo.CurrentCulture);
Can someone tell me the difference between using CultureInfo.CurrentCulture and CultureInfo.InvariantCulture, like the other answers? I was assuming things like the day name and month name might need to be parsed in their native language. Thanks.

Try:
var theDate = DateTime.ParseExact(
"Fri Jul 13 13-42-30 2012",
"ddd MMM dd HH-mm-ss yyyy",
System.Globalization.CultureInfo.InvariantCulture);
Date string formatting options can be found here.

That format doesn't seem all that odd, but you could probably easily handle it by using DateTime.ParseExact(). Of course, it assumes that the format remains the same.

try this way please
string format ="ddd MMM dd hh-mm-ss yyyy";
DateTime dt = DateTime.ParseExact(format, dateString, CultureInfo.InvariantCulture);

How to parse DateTime in this format? "Sun May 23 22:00:00 UTC+0300 2010"

This is a quick one, i wanna parse a date that comes in this format "Sun May 23 22:00:00 UTC+0300 2010"
Is this a valid UTC DateTime? And how to parse it? I tried :
DateTime newStartTime = DateTime.ParseExact(hdnNewStartTime.Value, "ddd MM dd HH:mm:ss UTC+0300 yyyy", CultureInfo.CurrentCulture);
However, this didn't work, any help appreciated!

DateTime dt = DateTime.ParseExact(s,"ddd MMM dd HH:mm:ss UTCzzzz yyyy", System.Globalization.CultureInfo.InvariantCulture);

Its not a standard format, but you can still parse it.
string format = "ddd mmm dd HH:mm:ss zzzzz yyyy";
string temp = "Sun May 23 22:00:00 UTC+0300 2010";
DateTime time = DateTime.ParseExact(temp, format, CultureInfo.InvariantCulture);

This isn't in a standard .NET format, so you'll probably have to parse it by hand. The UTC+0300 bit indicates the timezone, everything else is part of the date and time.

I tried the solution presented by #johncatfish and it does what I expect. I would presume that you actually want to keep the timezone information.
[Test()]
public void TestCaseWorks ()
{
string format = "ddd MMM dd HH:mm:ss UTCzzzzz yyyy";
string temp = "Sun May 23 22:00:00 UTC+0300 2010";
DateTime time = DateTime.ParseExact(temp, format, CultureInfo.InvariantCulture);
Assert.AreEqual(DayOfWeek.Sunday, time.DayOfWeek);
Assert.AreEqual(5, time.Month);
Assert.AreEqual(23, time.Day);
Assert.AreEqual(0, time.Minute);
Assert.AreEqual(0, time.Second);
Assert.AreEqual(2010, time.Year);
// Below is the only actually useful assert -- making sure the
// timezone was parsed correctly.
// In my case, I am GMT-0700, the target time is GMT+0300 so
// 22 + (-7 - +3) = 12 is the expected answer. It is an exercise
// for the reader to make a robust test that will work in any
// timezone ;).
Assert.AreEqual(12, time.Hour);
}

Sorry for my previous answer which was quite simplistic.
Replace MM by MMM in your date format and it should be fine.

From the example given, it isn't possible to tell if the month should be in the 3 letter form (Jan, Feb, May etc.) or in the full form (January, February, May etc.).
If it should be in the short form, use:
ddd MMM dd HH:mm:ss UTCzzz yyyy
If it should be in the long form, use:
ddd MMMM dd HH:mm:ss UTCzzz yyyy
Details of the formatting specifiers available can be found at http://msdn.microsoft.com/en-us/library/8kb3ddd4.aspx