When using CultureInfo.CurrentCulture.DateTimeFormat to get local date formats, is there a built in way to get only the day and month portion of the date returned by the local ShortTimePattern? e.g. dd/MM
Basically, in my razor view, I am doing something like this:
#someObject.Date.ToString("dd/MM")
But now need to make it work with the current culture so am hoping to find a way to provide a dynamic format mask based on the current culture. Imagine something like:
#someObject.Date.ToString(CultureInfo.CurrentCulture.DateTimeFormat.ShortDatePatternNoYear)
Setting the month and day pattern for each culture is bad news. The DRY principle in this case says to leverage each culture's date-time format, not repeat (and possibly contradict) it with a custom MonthDayPattern.
Instead leverage the Short Date ("d") format specifier to get the month and day in the proper order and properly separated for the culture in question, and then whack the year (and its separator).
var de = CultureInfo.CreateSpecificCulture("de-DE").DateTimeFormat;
var uk = CultureInfo.CreateSpecificCulture("en-GB").DateTimeFormat;
var us = CultureInfo.CreateSpecificCulture("en-US").DateTimeFormat;
var now = DateTime.Now;
var yearNow = now.Year.ToString(CultureInfo.InvariantCulture);
const string yearPattern = "(^{0}{1}|{1}{0}$)"; // {0} = year, {1} = date separator
var deDate = now.ToString("d", de);
var deYearlessDate =
Regex.Replace(
deDate,
String.Format(yearPattern, yearNow, de.DateSeparator),
"");
// or a double String.Replace instead of a Regex.Replace
//var deYearlessDate =
// deDate.Replace(de.DateSeparator + yearNow, "").Replace(yearNow + de.DateSeparator, "");
var ukDate = now.ToString("d", uk);
var ukYearlessDate =
Regex.Replace(
ukDate,
String.Format(yearPattern, yearNow, uk.DateSeparator),
"");
// or a double String.Replace instead of a Regex.Replace
//var ukYearlessDate =
// ukDate.Replace(uk.DateSeparator + yearNow, "").Replace(yearNow + uk.DateSeparator, "");
var usDate = now.ToString("d", us);
var usYearlessDate =
Regex.Replace(
usDate,
String.Format(yearPattern, yearNow, us.DateSeparator),
"");
// or a double String.Replace instead of a Regex.Replace
//var usYearlessDate =
// usDate.Replace(us.DateSeparator + nowYear, "").Replace(nowYear + us.DateSeparator, "");
Console.WriteLine(deYearlessDate); // 02.04
Console.WriteLine(ukYearlessDate); // 02/04
Console.WriteLine(usYearlessDate); // 4/2
The solution is to find your current culture and update the DateTimeFormat.MonthDayPattern.
Custom culture aware date format in .NET said that ShortDatePattern ("d") was unreliable and suggested the following method:
private static string FindMonthDayOnly(System.Globalization.CultureInfo ci)
{
string shortPattern = ci.DateTimeFormat.ShortDatePattern;
while(shortPattern[0] != 'd' && shortPattern[0] != 'M')
{
shortPattern = shortPattern.Substring(1);
if(shortPattern.Length == 0)
return ci.DateTimeFormat.ShortDatePattern;
}
while(shortPattern[shortPattern.Length - 1] != 'd' && shortPattern[shortPattern.Length - 1] != 'M')
{
shortPattern = shortPattern.Substring(0, shortPattern.Length - 1);
if(shortPattern.Length == 0)
return ci.DateTimeFormat.ShortDatePattern;
}
return shortPattern;
}
Then all you have to do is find somewhere convenient to run something like this (think carefully about background threads etc as this will only work with the current thread):
var culture = new CultureInfo(CultureInfo.CurrentCulture.IetfLanguageTag);
var newMonthDayString = FindMonthDayOnly(culture);
culture.DateTimeFormat.MonthDayPattern = newMonthDayString;
Thread.CurrentThread.CurrentCulture = culture;
Thanks for everyone's input. This seems to be working but please comment if you see any obvious issues with the solution.
I have created an Extension method to display only Month and day depending of the CultureInfo, hope it helps:
/// <summary>
/// Return a date formatted MonthDay depending of the current application cutlure
/// </summary>
/// <param name="datetime">The datetime to parse</param>
/// <returns>A Month day string representation</returns>
public static string ToMonthDay(this DateTime datetime)
{
// Get the current culture of the application
var culture = new CultureInfo(Thread.CurrentThread.CurrentCulture.Name);
// Get the format depending of the culture of the application
var output = culture.DateTimeFormat.ShortDatePattern;
// Remove the Year from from the date format
var format = output.Replace("Y", "").Replace("y", "");
// Remove any character before or after in the text string which is not a number
Regex rgx = new Regex("^[^a-zA-Z0-9]|[^a-zA-Z0-9]$");
format = rgx.Replace(format, "");
return datetime.ToString(format);
}
And the usage:
DateTime dateToDisplay = new DateTime(2009, 01, 31);
Thread.CurrentThread.CurrentCulture = new CultureInfo("fr-FR");
Console.WriteLine(dateToDisplay.ToMonthDay());
Thread.CurrentThread.CurrentCulture = new CultureInfo("en-US");
Console.WriteLine(dateToDisplay.ToMonthDay());
Related
In database I have a string that represent a date time that format is YY.MM (YY it means Year and MM is Month. for example 21.03 = 2021.03)
How can I map this special format(yy.mm) to this format(mm/yyyy) by using data annotation or another way ?
Try Parse date and then format back to the string:
using System.Globalization;
...
string source = "21.03";
// 03.2021
string result = DateTime
.ParseExact(source, "yy'.'MM", CultureInfo.InvariantCulture)
.ToString("MM'.'yyyy");
However, we have an ambiguity here: "03.50" can be either "March 1950" or "March 2050". The default policy is 00..29 to 2000..2029 and 30..99 to 1930..1999 if you want to change this policy you can create and use your own culture:
CultureInfo myCulture = CultureInfo.InvariantCulture.Clone() as CultureInfo;
// Everything to 20.., never 19..
myCulture.Calendar.TwoDigitYearMax = 2099;
string source = "99.03";
// 03.2099
string result = DateTime.ParseExact(source, "yy'.'MM", myCulture).ToString("MM'.'yyyy");
Or even
CultureInfo myCulture = CultureInfo.CurrentCulture.Clone() as CultureInfo;
// Everything to 20.., never 19..
myCulture.Calendar.TwoDigitYearMax = 2099;
// Current culture as usual, except 2 digit year policy
CultureInfo.CurrentCulture = myCulture;
...
string source = "99.03";
// 03.2099
string result = DateTime.ParseExact(source, "yy'.'MM", null).ToString("MM'.'yyyy");
You can do it like this using the string split function:
string dateIn = "11.10";
string month = dateIn.Split('.')[1]; //split the String at the point and save it
string year = dateIn.Split('.')[0];
string dateOut = $"{month}/20{year}"; //build a new string
//this will fix the 1900/2000 issue more or less as all dates in the furutre would be send back to the past you can adapt this to your need:
if( DateTime.Now.Year < Convert.ToInt32($"20{year}"))
{
dateOut = $"{month}/19{year}";
}
//dateOut is "10/2011"
Current culture of my application is set to Spanish but i need to convert my date to English in order to perform database operations.
currently date is coming in this format: "Dic 13, 2017"
I need to convert this to : "Dec 13, 2017"
what i have tried until now
var input = objDMSampleA.RequestDateFrom;
var format = "MMM dd, yyyy";
var dt = DateTime.ParseExact(input, format, new CultureInfo("es-ES"));
var result = dt.ToString(format, new CultureInfo("en-US"));
but the ParseExact gives error that
String was not recognized as a valid DateTime.
"Short" month names for given culture are stored in CultureInfo.DateTimeFormat.AbbreviatedMonthNames. For es-ES culture those names might have dot in the end (for example: "dic." instead of "dic"). For that reason, parsing your string fails - "Dic" doesn't have that dot.
To fix this, one way is to modify those names:
var esCulture = new CultureInfo("es-ES");
var monthNames = esCulture.DateTimeFormat.AbbreviatedMonthNames;
for (int i = 0; i < monthNames.Length; i++) {
monthNames[i] = monthNames[i].TrimEnd('.');
}
esCulture.DateTimeFormat.AbbreviatedMonthNames = monthNames;
monthNames = esCulture.DateTimeFormat.AbbreviatedMonthGenitiveNames;
for (int i = 0; i < monthNames.Length; i++)
{
monthNames[i] = monthNames[i].TrimEnd('.');
}
esCulture.DateTimeFormat.AbbreviatedMonthGenitiveNames = monthNames;
Then your code will work as expected:
var input = "Dic 13, 2017";
var format = "MMM dd, yyyy";
var dt = DateTime.ParseExact(input, format, esCulture);
var result = dt.ToString(format, new CultureInfo("en-US"));
It's better to store modified culture in some static field and reuse it, instead of creating it and changing every time.
If you want to modify current culture for all threads, use
CultureInfo.DefaultThreadCurrentCulture = esCulture;
though I won't recommend doing that.
I'm having a slight issue with Thread culture and getting a date to display properly.
I am overloading the ToString() method of the DateTime class.
With culture "en-CA", my date is coming out in the right format "yyyy/MM/dd"
but with culture "fr-CA", my date is coming out "yyyy-MM-dd"
I've made some unit test to display the issue.
The english test works but the french always fails.
Even if I change the GetDateInStringMethod to do .ToShortDateString. I still get the same issue.
[Test()]
public void ValidInEnglish()
{
Thread.CurrentThread.CurrentCulture = new CultureInfo("en-CA");
Thread.CurrentThread.CurrentCulture.DateTimeFormat.ShortDatePattern = Utility.DatePattern;
DateTime? currentDate = new DateTime(2009,02,7);
string expected = "2009/02/07";
string actual = DateUtils.GetDateInString(currentDate);
//This works
Assert.AreEqual(expected, actual);
}
[Test()]
public void ValidInFrench()
{
Thread.CurrentThread.CurrentCulture = new CultureInfo("fr-CA");
Thread.CurrentThread.CurrentCulture.DateTimeFormat.ShortDatePattern = Utility.DatePattern;
DateTime? currentDate = new DateTime(2009, 02, 7);
string expected = "2009/02/07";
string actual = DateUtils.GetDateInString(currentDate);
// This doesn't work
Assert.AreEqual(expected, actual);
}
public static string GetDateInString(DateTime? obj)
{
if (obj == null || !obj.HasValue)
{
return string.Empty;
}
return obj.Value.ToString(Utility.DatePattern);
}
public const string DatePattern = "yyyy/MM/dd";
Change this line:
return obj.Value.ToString(Utility.DatePattern);
to this:
return obj.Value.ToString(Utility.DatePattern, CultureInfo.InvariantCulture);
Read about it here: System.Globalization.InvariantCulture
That doesn't work because using french culture defaults the datetime formatter to use - instead of / as a separator character. If you want to keep your date the same no matter the culture then use CultureInfo.InvariantCulture if you want to use the french formatting the change your expected test result to "2009-02-07". If you are looking for more info check this msdn link.
And if you want a personal recommendation for a lib to use for dealing with the awesomeness that is Globalization then I'd recommend Noda Time.
This question already has answers here:
How to control appearance of ':' in time zone offset when parsing/formatting Datetime
(4 answers)
Closed 4 years ago.
I need to format a date like so: 20110202192008-0500. The following code does the trick but I was wondering if there is a better/cleaner way to do this in c# 3.5. Thanks!!
var date = DateTime.Now;
var strDate = TimeZoneInfo.ConvertTimeToUtc(date).ToString("yyyyMMddHHmmss");
var offsetHours = TimeZoneInfo.Local.GetUtcOffset(date).Hours.ToString("00");
var offsetMinutes = TimeZoneInfo.Local.GetUtcOffset(date).Minutes.ToString("00");
Console.Write(string.Concat(strDate, offsetHours, offsetMinutes));
How about this:
.NET 4
var utcOffset = TimeZone.CurrentTimeZone.GetUtcOffset(DateTime.Now);
Console.WriteLine(DateTime.UtcNow.ToString("yyyyMMddHHmmss") + ((utcOffset < TimeSpan.Zero) ? "-" : "+") + utcOffset.ToString("hhmm"));
.NET 3.5
var utcAlmostFormat = DateTime.UtcNow.ToString("yyyyMMddHHmmss") + TimeZone.CurrentTimeZone.GetUtcOffset(DateTime.Now);
var utcFormat = System.Text.RegularExpressions.Regex.Replace(utcAlmostFormat, #"(\d\d):(\d\d):(\d\d)",#"$1$2");
Console.WriteLine(utcFormat);
Go Steelers (from a guy in the Strip)
If you have a DateTimeOffset, the custom specifier zzz will output the timezone offset, though in the more standard "+HH:mm" format. If you don't want the colon, a string replace will do the trick.
Debug.WriteLine(DateTimeOffset.Now.ToString("yyyyMMddHHmmsszzz").Replace(":", ""));
// Result: "20110202153631-0500"
Here are some extension methods that will work in both .Net 3.5 and .Net 4.0 that will do exactly what you are asking in a very straight-forward way:
public static string ToStringWithOffset(this DateTime dt)
{
return new DateTimeOffset(dt).ToStringWithOffset();
}
public static string ToStringWithOffset(this DateTime dt, TimeSpan offset)
{
return new DateTimeOffset(dt, offset).ToStringWithOffset();
}
public static string ToStringWithOffset(this DateTimeOffset dt)
{
string sign = dt.Offset < TimeSpan.Zero ? "-" : "+";
int hours = Math.Abs(dt.Offset.Hours);
int minutes = Math.Abs(dt.Offset.Minutes);
return string.Format("{0:yyyyMMddHHmmss}{1}{2:00}{3:00}", dt, sign, hours, minutes);
}
You can now call these on any DateTime or DateTimeOffset you wish. For example:
string s = DateTime.Now.ToStringWithOffset();
or
string s = DateTimeTimeOffset.Now.ToStringWithOffset();
or
TimeSpan offset = TimeZoneInfo.Local.GetUtcOffset(someDate);
string s = someArbitraryTime.ToStringWithOffset(offset);
or any other number of ways you can think of.
We found that DateTimeOffset.ToString("o") is best for that. Example:
DateTime.UtcNow.UtcToDateTimeOffset(User.GetTimeZone()).ToString("o");
If you need to convert from DateTime, use helper method like:
/// <summary>Converts from a UTC DateTime to the user's local DateTime</summary>
/// <param name="utcDateTime">UTC DateTime</param>
/// <param name="timeZoneInfo">The time zone info.</param>
/// <returns>The DateTime in the user's time zone</returns>
public static DateTimeOffset UtcToDateTimeOffset(this DateTime utcDateTime, TimeZoneInfo timeZoneInfo = null)
{
if (utcDateTime.Kind != DateTimeKind.Utc)
{
throw new InvalidTimeZoneException("Converting UTC to Local TimeZone, but was not UTC.");
}
DateTimeOffset dto = new DateTimeOffset(utcDateTime, TimeSpan.Zero);
return timeZoneInfo.IsNotNull() ? dto.ToOffset(timeZoneInfo.GetUtcOffset(dto)) : dto;
}
You can use one of the DateTime Standard Formats or create a Custom Format.
// Round-trip date/time pattern: "O", "o"
DateTime.Now.ToString("o") // "2018-01-15T11:00:50.5604578-05:00"
DateTime.UtcNow.ToString("o") // "2018-01-15T16:00:50.5604578Z"
// Universal sortable date/time pattern: "u"
DateTime.Now.ToString("u") // "2018-01-15 16:00:50.5604578Z"
DateTime.UtcNow.ToString("u") // "2018-01-15 16:00:50.5604578Z"
// Custom format
DateTime.Now.ToString("yyyyMMddHHmmssK") // "20180115160050-05:00"
DateTime.UtcNow.ToString("yyyyMMddHHmmssK") // "20180115160050Z"
Try to use
var date = DateTimeOffset.Now;
var timestamp = $"{date:yyyy-MM-dd'T'HH:mm:ss.fff}{date.Offset.Ticks:+;-;}{date.Offset:hhmm}";
... or something like this.
I think there are a lot of ways, for example:
var offset = TimeZoneInfo.Local.BaseUtcOffset;
string result = DateTime.UtcNow.ToString("yyyyMMddHHmmss") + offset.Hours.ToString("00") + offset.Minutes.ToString("00");
In my C# Data Access Layer...I am retrieving a dataset from Excel ...and there is a decimal excel field which returns date in the format : 20090701. I need this to be converted to C# DateTime. What is the best way to do it?
DateTime.ParseExact( value.ToString(), "yyyymmdd" );
The ParseExact method allows you to specify the format string for the date/time you are converting. In your case: a four digit year, then two digit month, then two digit day of month.
I would do something like this if you want to implement it application wide.
System.Globalization.CultureInfo cultureInfo =
new System.Globalization.CultureInfo("en-CA");
// Defining various date and time formats.
dateTimeInfo.LongDatePattern = "yyyyMMdd";
dateTimeInfo.ShortDatePattern = "yyyyMMdd";
dateTimeInfo.FullDateTimePattern = "yyyyMMdd";
// Setting application wide date time format.
cultureInfo.DateTimeFormat = dateTimeInfo;
// Assigning our custom Culture to the application.
//Application.CurrentCulture = cultureInfo;
Thread.CurrentThread.CurrentCulture = cultureInfo;
Thread.CurrentThread.CurrentUICulture = cultureInfo;
DateTime.Parse(excelDate);
And a less intuitive answer for good measure.
var a = 20090701m;
var b = a / 10000;
var year = (int)b;
var c = (b - year) * 100;
var month = (int)c;
var day = (int)((c - month) * 100);
var dt = new DateTime(year, month, day);