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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Start and End Time of a DateTime in C#

To get the start and end times of a day in C#, you can use the DateTime.Date property to remove the time component of a DateTime object, and then add or subtract a TimeSpan of one day to get the start or end of the day, respectively. Here are some examples:

DateTime now = DateTime.Now;
DateTime startOfDay = now.Date; // The start of the current day
DateTime endOfDay = now.Date.AddDays(1).AddTicks(-1); // The end of the current day

To get the start day of a month in C#, you can create a DateTime object for the first day of the month:

DateTime now = DateTime.Now;
DateTime startOfMonth = new DateTime(now.Year, now.Month, 1);

To get the last day of a month in C#, you can create a DateTime object for the first day of the next month, and then subtract one day:

DateTime now = DateTime.Now;
DateTime endOfMonth = new DateTime(now.Year, now.Month, 1).AddMonths(1).AddDays(-1);

To get the last day of the next month in C#, you can create a DateTime object for the first day of the month after next, and then subtract one day:

DateTime now = DateTime.Now;
DateTime endOfNextMonth = new DateTime(now.Year, now.Month, 1).AddMonths(2).AddDays(-1);

To get the start day of the previous month in C#, you can create a DateTime object for the first day of the current month, and then subtract one month:

DateTime now = DateTime.Now;
DateTime startOfPreviousMonth = new DateTime(now.Year, now.Month, 1).AddMonths(-1);

To get the last day of the previous month in C#, you can create a DateTime object for the first day of the current month, subtract one day to get the last day of the previous month, and then remove the time component:

DateTime now = DateTime.Now;
DateTime endOfPreviousMonth = new DateTime(now.Year, now.Month, 1).AddDays(-1).Date;

To get the first day of a year in C#, you can create a DateTime object for January 1st of the year:

DateTime now = DateTime.Now;
DateTime startOfYear = new DateTime(now.Year, 1, 1);

To get the last day of a year in C#, you can create a DateTime object for January 1st of the next year, and then subtract one day:

DateTime now = DateTime.Now;
DateTime endOfYear = new DateTime(now.Year + 1, 1, 1).AddDays(-1);

1. C# get start time of DateTime: To get the start time of a DateTime object, you can use the Date property.

   DateTime myDateTime = DateTime.Now;
   DateTime startTime = myDateTime.Date;
   Console.WriteLine($"Start time of DateTime: {startTime}");
   

2. Extracting time portion from DateTime in C#: Extracting the time portion of a DateTime can be done by subtracting the date part.

   DateTime myDateTime = DateTime.Now;
   TimeSpan timeOfDay = myDateTime - myDateTime.Date;
   Console.WriteLine($"Time portion of DateTime: {timeOfDay}");
   

3. Get the beginning of the day in C# DateTime: Getting the beginning of the day is essentially getting the start time.

   DateTime myDateTime = DateTime.Now;
   DateTime startOfDay = myDateTime.Date;
   Console.WriteLine($"Beginning of the day: {startOfDay}");
   

4. C# get end time of DateTime: To get the end time of a DateTime object, you can use the Date property and add 1 day.

   DateTime myDateTime = DateTime.Now;
   DateTime endTime = myDateTime.Date.AddDays(1).AddTicks(-1);
   Console.WriteLine($"End time of DateTime: {endTime}");
   

5. Extracting date and time components in C#: Extracting both date and time components separately.

   DateTime myDateTime = DateTime.Now;
   DateTime dateComponent = myDateTime.Date;
   TimeSpan timeComponent = myDateTime.TimeOfDay;
   Console.WriteLine($"Date Component: {dateComponent}, Time Component: {timeComponent}");
   

6. Start and end time of day in C# using DateTime: Combining the start and end time of the day.

   DateTime myDateTime = DateTime.Now;
   DateTime startOfDay = myDateTime.Date;
   DateTime endOfDay = myDateTime.Date.AddDays(1).AddTicks(-1);
   Console.WriteLine($"Start of the day: {startOfDay}, End of the day: {endOfDay}");
   

7. C# DateTime start of week: Getting the start of the week involves finding the first day and time of the week.

   DateTime myDateTime = DateTime.Now;
   DayOfWeek startOfWeek = DayOfWeek.Monday; // or Sunday
   DateTime startOfWeekDate = myDateTime.Date.AddDays(-(int)myDateTime.DayOfWeek - (int)startOfWeek);
   Console.WriteLine($"Start of the week: {startOfWeekDate}");
   

8. Getting midnight time from DateTime in C#: Retrieving midnight time is equivalent to getting the start time of the day.

   DateTime myDateTime = DateTime.Now;
   DateTime midnightTime = myDateTime.Date;
   Console.WriteLine($"Midnight time: {midnightTime}");
   

9. Retrieve time component without date in C#: If you only want the time without the date, extract the time portion.

   DateTime myDateTime = DateTime.Now;
   TimeSpan timeWithoutDate = myDateTime.TimeOfDay;
   Console.WriteLine($"Time without date: {timeWithoutDate}");
   

10. Extracting hours and minutes from DateTime in C#: Extracting specific components like hours and minutes.

    DateTime myDateTime = DateTime.Now;
    int hours = myDateTime.Hour;
    int minutes = myDateTime.Minute;
    Console.WriteLine($"Hours: {hours}, Minutes: {minutes}");