DateTime in C#

How to convert a string to DateTime in C#:

You can use the DateTime.Parse or DateTime.ParseExact methods to convert a string to a DateTime object in C#. Here's an example:

string dateString = "2022-03-28";
DateTime dateTime = DateTime.Parse(dateString); // or DateTime.ParseExact(dateString, "yyyy-MM-dd", CultureInfo.InvariantCulture);

In the above example, we have a string that represents a date in the format "yyyy-MM-dd". We then use the DateTime.Parse or DateTime.ParseExact method to convert the string to a DateTime object.

Append TimeStamp to a File Name in C#:

You can use the DateTime.Now property to get the current date and time, and append it to a file name to create a timestamp. Here's an example:

string fileName = "example.txt";
string timeStamp = DateTime.Now.ToString("yyyyMMddHHmmss");
string newFileName = $"{fileName}_{timeStamp}";

In the above example, we have a string that represents a file name. We then use the DateTime.Now property to get the current date and time, and format it as a string in the format "yyyyMMddHHmmss". We then append the timestamp to the file name using string interpolation to create a new file name.

How to convert a DateTime to a number in C#:

You can use the DateTime.Ticks property to convert a DateTime object to a long value in C#. Here's an example:

DateTime dateTime = DateTime.Now;
long ticks = dateTime.Ticks;

In the above example, we have a DateTime object that represents the current date and time. We then use the DateTime.Ticks property to get the number of ticks that have elapsed since January 1, 0001 at 12:00:00 midnight, and assign it to a long variable.

How to get only time part from a DateTime in C#:

You can use the DateTime.TimeOfDay property to get the time part of a DateTime object in C#. Here's an example:

DateTime dateTime = DateTime.Now;
TimeSpan time = dateTime.TimeOfDay;

In the above example, we have a DateTime object that represents the current date and time. We then use the DateTime.TimeOfDay property to get the time part of the DateTime object as a TimeSpan.

How to get milliseconds from a DateTime in C#:

You can use the DateTime.Millisecond property to get the milliseconds component of a DateTime object in C#. Here's an example:

DateTime dateTime = DateTime.Now;
int milliseconds = dateTime.Millisecond;

In the above example, we have a DateTime object that represents the current date and time. We then use the DateTime.Millisecond property to get the milliseconds component of the DateTime object as an int.

Parsing DateTime in C#
Parsing DateTime in C# involves converting a string representation of a date and time into a DateTime object.
```
string dateString = "2023-12-21";
DateTime parsedDate = DateTime.Parse(dateString);
```
Formatting DateTime in C#
Formatting DateTime in C# allows you to represent a DateTime object as a string in a specific format.
```
DateTime currentDate = DateTime.Now;
string formattedDate = currentDate.ToString("yyyy-MM-dd HH:mm:ss");
```
Current DateTime in C#
Obtain the current DateTime in C# using the DateTime.Now property.
```
DateTime currentDateTime = DateTime.Now;
```

Adding and subtracting time with DateTime in C#

Perform addition and subtraction on DateTime objects to manipulate dates and times.

DateTime currentDate = DateTime.Now;
DateTime futureDate = currentDate.AddHours(24);
DateTime pastDate = currentDate.AddMonths(-1);

Comparing DateTime objects in C#

Compare DateTime objects in C# to determine their relative order.

DateTime date1 = DateTime.Parse("2023-01-01");
DateTime date2 = DateTime.Parse("2023-02-01");

if (date1 < date2)
{
    // date1 is earlier than date2
}

DateTime operations and calculations in C#
Perform various DateTime operations and calculations, such as finding the difference between two dates.
```
DateTime start = DateTime.Parse("2023-01-01");
DateTime end = DateTime.Parse("2023-12-31");
TimeSpan duration = end - start;
```
Converting DateTime to string in C#
Convert a DateTime object to a string using the ToString method.
```
DateTime currentDate = DateTime.Now;
string dateString = currentDate.ToString();
```

Parsing custom date formats in C#

Parse DateTime with custom date formats using DateTime.ParseExact.

string dateString = "12/21/2023";
DateTime parsedDate = DateTime.ParseExact(dateString, "MM/dd/yyyy", null);

Working with time zones in C# DateTime

Adjust DateTime to a specific time zone using the TimeZoneInfo class.

DateTime utcTime = DateTime.UtcNow;
TimeZoneInfo timeZone = TimeZoneInfo.FindSystemTimeZoneById("Pacific Standard Time");
DateTime localTime = TimeZoneInfo.ConvertTimeFromUtc(utcTime, timeZone);

DateTime.TryParse vs. DateTime.Parse in C#

Use DateTime.TryParse to avoid exceptions when parsing DateTime from a string.

string dateString = "2023-12-21";
DateTime parsedDate;

if (DateTime.TryParse(dateString, out parsedDate))
{
    // Parsing successful
}

DateTime manipulation using TimeSpan in C#

Use TimeSpan for DateTime manipulation, such as adding or subtracting intervals.

DateTime startDate = DateTime.Parse("2023-01-01");
TimeSpan interval = TimeSpan.FromDays(30);
DateTime endDate = startDate + interval;

Handling null DateTime in C#
Handle null DateTime by using nullable DateTime (DateTime?).
```
DateTime? nullableDate = null;
```
DateTime offset in C#
Use DateTimeOffset to represent a point in time with an offset from UTC.
```
DateTimeOffset dateTimeOffset = DateTimeOffset.Now;
```