C# DateTime Examples

• DateTime in C#
• Calculate age
• Calculate Days Difference
• Calculate Week
• Calculate Time Difference
• Calculate elapsed time
• Change Time section in DateTime
• Start and End Time
• Determine whether time periods overlap
• DateTime Format
• Unix timestamp
• UTC DateTime

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• DateTime in C#

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DateTime Format in C#

• Convert DateTime to "yyyyMMddHHmmss" format in C#:

You can use the ToString() method of the DateTime object to convert it to a string in a specific format. To convert a DateTime object to the "yyyyMMddHHmmss" format in C#, you can use the following code:

DateTime inputDate = DateTime.Now;
string formattedDate = inputDate.ToString("yyyyMMddHHmmss");

• Convert a string value format with "yyyyMMddHHmmss" to a C# DateTime:

To convert a string value with the "yyyyMMddHHmmss" format to a DateTime object in C#, you can use the DateTime.ParseExact() method. Here's an example:

string dateString = "20220327124530"; // March 27, 2022, 12:45:30 PM
DateTime result = DateTime.ParseExact(dateString, "yyyyMMddHHmmss", CultureInfo.InvariantCulture);

In the above example, we have a string value with the "yyyyMMddHHmmss" format representing a date and time. We use the DateTime.ParseExact() method to parse the string and convert it to a DateTime object. The method takes the string value to be parsed, the format string to match the string value, and a CultureInfo object that provides culture-specific formatting information.

• Remove time portion of date in C# DateTime:

To remove the time portion of a DateTime object in C#, you can use the DateTime.Date property to get a new DateTime object with the same date as the input, but with the time component set to midnight. Here's an example:

DateTime inputDate = DateTime.Now;
DateTime dateWithoutTime = inputDate.Date;

• How to convert DateTime to Year format in C#:

To convert a DateTime object to a string in the year format in C#, you can use the ToString() method with the "yyyy" format specifier. Here's an example:

DateTime inputDate = DateTime.Now;
string yearString = inputDate.ToString("yyyy");

• How to convert DateTime to month format in C#:

To convert a DateTime object to a string in the month format in C#, you can use the ToString() method with the "MM" format specifier. Here's an example:

DateTime inputDate = DateTime.Now;
string monthString = inputDate.ToString("MM");

• How to convert DateTime to day format in C#:

To convert a DateTime object to a string in the day format in C#, you can use the ToString() method with the "dd" format specifier. Here's an example:

DateTime inputDate = DateTime.Now;
string dayString = inputDate.ToString("dd");

• How to convert DateTime to 12 hour / 24 hour format in C#:

To convert a DateTime object to a string in the 12-hour or 24-hour format in C#, you can use the ToString() method with the "hh" or "HH" format specifier for the hour component, depending on the desired format. Here's an example:

DateTime inputDate = DateTime.Now;
string hour12String = inputDate.ToString("hh"); // 12-hour format
string hour24String = inputDate.ToString("HH"); // 24-hour format

• How to convert DateTime to minute format in C#:

To convert a DateTime object to a string in the minute format in C#, you can use the ToString() method with the "mm" format specifier. Here's an example:

DateTime inputDate = DateTime.Now;
string minuteString = inputDate.ToString("mm");

• How to convert DateTime to second format in C#:

To convert a DateTime object to a string in the second format in C#, you can use the ToString() method with the "ss" format specifier. Here's an example:

DateTime inputDate = DateTime.Now;
string secondString = inputDate.ToString("ss");

• How to convert DateTime to second fraction format in C#:

To convert a DateTime object to a string in the second fraction format in C#, you can use the ToString() method with the "fff" format specifier. Here's an example:

DateTime inputDate = DateTime.Now;
string fractionString = inputDate.ToString("fff");

• How to convert DateTime to A.M. or P.M. in 12 hour format in C#:

To convert a DateTime object to a string in the A.M. or P.M. format in the 12-hour format in C#, you can use the ToString() method with the "tt" format specifier. Here's an example:

DateTime inputDate = DateTime.Now;
string ampmString = inputDate.ToString("tt");

• How to get time zone from DateTime in C#:

To get the time zone from a DateTime object in C#, you can use the DateTimeOffset.Offset property to get the time zone offset. Here's an example:

DateTime inputDate = DateTime.Now;
TimeSpan offset = TimeZoneInfo.Local.GetUtcOffset(inputDate);
string timeZoneString = offset.ToString();

• How to convert DateTime to month/day number without leading zero and 2 digit year in C#:

To convert a DateTime object to a string in the month/day number format without a leading zero and a 2-digit year in C#, you can use the ToString() method with the "M/d/yy" format specifier. Here's an example:

DateTime inputDate = DateTime.Now;
string monthDayYearString = inputDate.ToString("M/d/yy");

• How to convert DateTime to month/day number with leading zero and 4 digit year in C#:

To convert a DateTime object to a string in the month/day number format with a leading zero and a 4-digit year in C#, you can use the ToString() method with the "MM/dd/yyyy" format specifier. Here's an example:

DateTime inputDate = DateTime.Now;
string monthDayYearString = inputDate.ToString("MM/dd/yyyy");

• How to convert DateTime to month/day number with hour/minute/second in C#:

To convert a DateTime object to a string in the month/day number format with the hour, minute, and second components in C#, you can use the ToString() method with the "MM/dd/yyyy HH:mm:ss" format specifier. Here's an example:

DateTime inputDate = DateTime.Now;
string monthDayTimeString = inputDate.ToString("MM/dd/yyyy HH:mm:ss");

• How to convert DateTime to month/day short name in C#:

To convert a DateTime object to a string in the month/day short name format in C#, you can use the ToString() method with the "MMM d" format specifier. Here's an example:

DateTime inputDate = DateTime.Now;
string monthDayShortString = inputDate.ToString("MMM d");

• How to convert DateTime to month/day name in C#:

To convert a DateTime object to a string in the month/day name format in C#, you can use the ToString() method with the "MMMM d" format specifier. Here's an example:

DateTime inputDate = DateTime.Now;
string monthDayNameString = inputDate.ToString("MMMM d");

• How to convert DateTime to month/day name with hour/minute/second in C#:

To convert a DateTime object to a string in the month/day name format with the hour, minute, and second components in C#, you can use the ToString() method with the "MMMM d HH:mm:ss" format specifier. Here's an example:

DateTime inputDate = DateTime.Now;
string monthDayTimeNameString = inputDate.ToString("MMMM d HH:mm:ss");

• Standard DateTime Formatting in C#:

In addition to the custom format specifiers we've covered above, C# provides a number of standard format specifiers that you can use with the ToString() method to format a DateTime object. Here are some examples:

DateTime inputDate = DateTime.Now;
string shortDateString = inputDate.ToString("d"); // Short date format
string longDateString = inputDate.ToString("D"); // Long date format
string fullDateTimeString = inputDate.ToString("F"); // Full date and time format
string generalDateTimeString = inputDate.ToString("G"); // General date and time format
string sortableDateTimeString = inputDate.ToString("s"); // Sortable date and time format
string universalSortableDateTimeString = inputDate.ToString("u"); // Universal sortable date and time format
string yearMonthString = inputDate.ToString("Y"); // Year and month format

1. C# DateTime format string: In C#, a DateTime format string is used to specify the desired format when converting a DateTime object to a string.

   DateTime myDateTime = DateTime.Now;
   string formattedDateTime = myDateTime.ToString("yyyy-MM-dd HH:mm:ss");
   Console.WriteLine($"Formatted DateTime: {formattedDateTime}");
   

2. Custom DateTime format in C#: You can create a custom DateTime format string to represent the date and time in a specific way.

   DateTime myDateTime = DateTime.Now;
   string customFormattedDateTime = myDateTime.ToString("MMMM dd, yyyy HH:mm:ss");
   Console.WriteLine($"Custom Formatted DateTime: {customFormattedDateTime}");
   

3. Formatting DateTime to string in C#: Using the ToString method to format a DateTime object as a string.

   DateTime myDateTime = DateTime.Now;
   string formattedDateTime = myDateTime.ToString();
   Console.WriteLine($"Formatted DateTime: {formattedDateTime}");
   

4. Standard date and time formats in C#: C# provides standard format specifiers for common date and time formats.

   DateTime myDateTime = DateTime.Now;
   string shortDateFormat = myDateTime.ToString("d");
   string longTimeFormat = myDateTime.ToString("T");
   Console.WriteLine($"Short Date Format: {shortDateFormat}, Long Time Format: {longTimeFormat}");
   

5. C# DateTime to string with specific format: Using the ToString method with a specific format string.

   DateTime myDateTime = DateTime.Now;
   string customFormat = "yyyy-MM-dd HH:mm:ss";
   string formattedDateTime = myDateTime.ToString(customFormat);
   Console.WriteLine($"Formatted DateTime: {formattedDateTime}");
   

6. Parse DateTime with custom format in C#: Parsing a DateTime from a string with a custom format.

   string dateString = "2023-01-15 14:30:00";
   DateTime parsedDateTime = DateTime.ParseExact(dateString, "yyyy-MM-dd HH:mm:ss", CultureInfo.InvariantCulture);
   Console.WriteLine($"Parsed DateTime: {parsedDateTime}");
   

7. DateTime format specifier in C#: Using format specifiers to represent different components of the DateTime.

   DateTime myDateTime = DateTime.Now;
   string year = myDateTime.ToString("yyyy");
   string month = myDateTime.ToString("MM");
   Console.WriteLine($"Year: {year}, Month: {month}");
   

8. Culture-specific DateTime formatting in C#: Formatting a DateTime based on a specific culture.

   DateTime myDateTime = DateTime.Now;
   CultureInfo customCulture = new CultureInfo("fr-FR");
   string formattedDateTime = myDateTime.ToString("F", customCulture);
   Console.WriteLine($"Formatted DateTime (French culture): {formattedDateTime}");
   

9. Short date and long date format in C#: Representing a DateTime in short and long date formats.

   DateTime myDateTime = DateTime.Now;
   string shortDateFormat = myDateTime.ToString("d");
   string longDateFormat = myDateTime.ToString("D");
   Console.WriteLine($"Short Date Format: {shortDateFormat}, Long Date Format: {longDateFormat}");
   

10. Formatting DateTime for file names in C#: Creating a string representation of a DateTime suitable for file names.

    DateTime myDateTime = DateTime.Now;
    string formattedForFileName = myDateTime.ToString("yyyyMMdd_HHmmss");
    Console.WriteLine($"Formatted for File Name: {formattedForFileName}");