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Convert time string to DateTime in c#

How can I get a DateTime based on a string
e.g:
if I have mytime = "14:00"
How can I get a DateTime object with current date as the date, unless current time already 14:00:01, then the date should be the next day.

This is as simple as parsing a DateTime with an exact format.
Achievable with
var dateStr = "14:00";
var dateTime = DateTime.ParseExact(dateStr, "H:mm", null, System.Globalization.DateTimeStyles.None);
The DateTime.ParseExact() (msdn link) method simply allows you to pass the format string you wish as your parse string to return the DateTime struct. Now the Date porition of this string will be defaulted to todays date when no date part is provided.
To answer the second part
How can I get a DateTime object with current date as the date, unless
current time already 14:00:01, then the date should be the next day.
This is also simple, as we know that the DateTime.ParseExact will return todays date (as we havevnt supplied a date part) we can compare our Parsed date to DateTime.Now. If DateTime.Now is greater than our parsed date we add 1 day to our parsed date.
var dateStr = "14:00";
var now = DateTime.Now;
var dateTime = DateTime.ParseExact(dateStr, "H:mm", null, System.Globalization.DateTimeStyles.None);
if (now > dateTime)
dateTime = dateTime.AddDays(1);

You can use DateTime.TryParse(): which will convert the specified string representation of a date and time to its DateTime equivalent and returns a value that indicates whether the conversion succeeded.
string inTime="14:00";
if(DateTime.TryParse(inTime,out DateTime dTime))
{
Console.WriteLine($"DateTime : {dTime.ToString("dd-MM-yyyy HH:mm:SS")}");
}
Working example here

There is a datetime constructor for
public DateTime(
int year,
int month,
int day,
int hour,
int minute,
int second
)
So then parse the string to find the hours, minutes, and seconds and feed that into this constructor with the other parameters supplied by Datetime.Now.Day and so on.

I think you want to do something like this:
string myTime = "14:00";
var v = myTime.Split(":".ToCharArray(), StringSplitOptions.RemoveEmptyEntries);
DateTime obj = new DateTime(DateTime.Now.Year, DateTime.Now.Month, DateTime.Now.Day, int.Parse(v[0]), int.Parse(v[1]), DateTime.Now.Second);

TimeSpan.ParseExact("000000.000", "hhmmss.fff", CultureInfo.CurrentCulture); Input string was not in a correct format C#?

I want to setup two TimeSpans lasttimestamp and time and set them to 0 like this :
TimeSpan lasttimestamp = TimeSpan.ParseExact("000000.000","hhmmss.fff",CultureInfo.CurrentCulture);
TimeSpan time = TimeSpan.ParseExact("000000.000", "hhmmss.fff", CultureInfo.CurrentCulture);
then in a later while loop i want to set timestamp to a value in a log file in in the format hhmmss.fff and subtract it from the lasttimestamp timespan :
TimeSpan timestamp = TimeSpan.ParseExact(splitline[1], "hhmmss.fff", CultureInfo.CurrentCulture);
time = timestamp.Subtract(lasttimestamp);
how ever it does not like the .fff part in the formating resulting in "Input string was not in a correct format" ?
I have tried with DateTime but get cannot convert TimeSpan to DateTime when performing the subtraction.
Thanks

You need to escape . in your format like #"hhmmss\.fff":
TimeSpan lasttimestamp = TimeSpan.ParseExact(#"000000.000",
#"hhmmss\.fff", CultureInfo.CurrentCulture);
But, you should use TimeSpan.Zero to set up zero time stamp like:
TimeSpan lastTimeSpanZero = TimeSpan.Zero;
Both will return same value.
(lasttimestamp == lastTimeSpanZero) == true
Later on, in your parsing escape the ..
TimeSpan timestamp = TimeSpan.ParseExact(splitline[1],
#"hhmmss\.fff", CultureInfo.CurrentCulture);

How to check if a Date/Time is bigger than another

i read a ini-file with a saved Date/Time string inside.
[Data]
Update = 07.02.2014 13:30:36
Rate_s = 5
I have both values as string in my C# program.
Now i want to save the "Update" in a value (Update_old) and the next time i read the file i want to check if Update_old+Rate_s >= Update_new
Means
The first time i read the file:
Update_old = 07.02.2014 13:30:36
Then 10 seconds later
Update_New = 07.02.2014 13:30:46
I need to know if the time changed.
My question is now how to convert the string with the date and time into something where i can add the 5secs and how to compare then the two values (old+rate against new)
It is possible that a new time is only 5seconds later but i can be also 1day 5hours later.
Thanks for the help

You need to parse the string values into a DateTime struct using DateTime.Parse. Then simply compare with <, >, ==, or !=
DateTime Update_New = DateTime.Parse("07.02.2014 13:30:36");
if (Update_New > Update_old)
{
}
If you want to manipulate the values use the AddX on the DateTime
Update_New = Update_New.AddSeconds(5);
Update_New = Update_New.AddHours(5);
Update_New = Update_New.AddDays(1);

If you parse both Update_old and Update_new into DateTimes, one of the possible results of subtraction of 2 date times is a TimeSpan, which conveniently has properties like TotalSeconds i.e.
if ((UpdateNewDateTime - UpdateOldDateTime).TotalSeconds > 5)
{ ...
However, if you are doing a lot of date manipulation, I would suggest you to also consider looking at NodaTime. This also takes into consideration issues with standard .Net DateTime like TimeZones, daylight savings, and inconsistencies in human calendars.

You can use DateTime.ParseExact to get a datetime and TimeSpan.FromSeconds to get a TimeSpan of 5 seconds.
string Update_old = "07.02.2014 13:30:36";
string Rate_s = "5";
DateTime oldDt = DateTime.ParseExact(Update_old, "dd.MM.yyyy HH:mm:ss", CultureInfo.InvariantCulture);
string Update_New = "07.02.2014 13:30:46";
DateTime newDt = DateTime.ParseExact(Update_New, "dd.MM.yyyy HH:mm:ss", CultureInfo.InvariantCulture);
TimeSpan seconds = TimeSpan.FromSeconds(int.Parse(Rate_s));
if (oldDt + seconds > newDt)
{
// ...
}
Side-note: instead of using ParseExact you can also use DateTime.Parse with the correct culture. In this case it could be german culture("de-DE"):
var deCulture = CultureInfo.CreateSpecificCulture("de-DE");
DateTime oldDt = DateTime.Parse("07.02.2014 13:30:36", deCulture);
DateTime newDt = DateTime.Parse("07.02.2014 13:30:46", deCulture);
Since it's a file i would not use DateTime.Parse without a culture because the current-culture could change.

convert string to datetime type;
DateTime start = (DateTime)strDateTime.toDate("dd.MM.yyyy H:mm:ss");
as Tim Schmelter said use TimeSpan to add period of time ( as an ex. 10 sec )
TimeSpan seconds = TimeSpan.FromSeconds(10);
and compare using operators <=, >=, ==, >, <.

how to convert 24-hour format TimeSpan to 12-hour format TimeSpan?

I have TimeSpan data represented as 24-hour format, such as 14:00:00, I wanna convert it to 12-hour format, 2:00 PM, I googled and found something related in stackoverflow and msdn, but didn't solve this problem, can anyone help me? Thanks in advance.
Update
Seems that it's possible to convert 24-hour format TimeSpan to String, but impossible to convert the string to 12-hour format TimeSpan :(
But I still got SO MANY good answers, thanks!

(Summing up my scattered comments in a single answer.)
First you need to understand that TimeSpan represents a time interval. This time interval is internally represented as a count of ticks an not the string 14:00:00 nor the string 2:00 PM. Only when you convert the TimeSpan to a string does it make sense to talk about the two different string representations. Switching from one representation to another does not alter or convert the tick count stored in the TimeSpan.
Writing time as 2:00 PM instead of 14:00:00 is about date/time formatting and culture. This is all handled by the DateTime class.
However, even though TimeSpan represents a time interval it is quite suitable for representing the time of day (DateTime.TimeOfDay returns a TimeSpan). So it is not unreasonable to use it for that purpose.
To perform the formatting described you need to either rely on the formatting logic of DateTime or simply create your own formatting code.
Using DateTime:
var dateTime = new DateTime(timeSpan.Ticks); // Date part is 01-01-0001
var formattedTime = dateTime.ToString("h:mm tt", CultureInfo.InvariantCulture);
The format specifiers using in ToString are documented on the Custom Date and Time Format Strings page on MSDN. It is important to specify a CultureInfo that uses the desired AM/PM designator. Otherwise the tt format specifier may be replaced by the empty string.
Using custom formatting:
var hours = timeSpan.Hours;
var minutes = timeSpan.Minutes;
var amPmDesignator = "AM";
if (hours == 0)
hours = 12;
else if (hours == 12)
amPmDesignator = "PM";
else if (hours > 12) {
hours -= 12;
amPmDesignator = "PM";
}
var formattedTime =
String.Format("{0}:{1:00} {2}", hours, minutes, amPmDesignator);
Admittedly this solution is quite a bit more complex than the first method.

TimeSpan represents a time interval not a time of day. The DateTime structure is more likely what you're looking for.

You need to convert the TimeSpan to a DateTime object first, then use whatever DateTime format you need:
var t = DateTime.Now.TimeOfDay;
Console.WriteLine(new DateTime(t.Ticks).ToString("hh:mm:ss tt"));
ToShortTimeString() would also work, but it's regional-settings dependent so it would not display correctly (or correctly, depending on how you see it) on non-US systems.

TimeSpan represents a time interval (a difference between times),
not a date or a time, so it makes little sense to define it in 24 or 12h format. I assume that you actually want a DateTime.
For example 2 PM of today:
TimeSpan ts = TimeSpan.FromHours(14);
DateTime dt = DateTime.Today.Add(ts);
Then you can format that date as you want:
String formatted = String.Format("{0:d/M/yyyy hh:mm:ss}", dt); // "12.4.1012 02:00:00" - german (de-DE)
http://msdn.microsoft.com/en-us/library/az4se3k1%28v=vs.100%29.aspx

Try This Code:
int timezone = 0;
This string gives 12-hours format
string time = DateTime.Now.AddHours(-timezone).ToString("hh:mm:ss tt");
This string gives 24-hours format
string time = DateTime.Now.AddHours(-timezone).ToString("HH:mm:ss tt");

Assuming you are staying in a 24 hour range, you can achieve what you want by subtracting the negative TimeSpan from Today's DateTime (or any date for that matter), then strip the date portion:
DateTime dt = DateTime.Today;
dt.Subtract(-TimeSpan.FromHours(14)).ToShortTimeString();
Yields:
2:00 PM

String formatted = yourDateTimeValue.ToString("hh:mm:ss tt");

It is very simple,
Let's suppose we have an object ts of TimesSpan :
TimeSpan ts = new TimeSpan();
and suppose it contains some value like 14:00:00
Now first convert this into a string and then in DateTime
as following:
TimeSpan ts = new TimeSpan(); // this is object of TimeSpan and Suppose it contains
// value 14:00:00
string tIme = ts.ToString(); // here we convert ts into String and Store in Temprary
// String variable.
DateTime TheTime = new DateTime(); // Creating the object of DateTime;
TheTime = Convert.ToDateTime(tIme); // now converting our temporary string into DateTime;
Console.WriteLine(TheTime.ToString(hh:mm:ss tt));
this will show the Result as: 02:00:00 PM

Normal Datetime can be converted in either 24 or 12 hours format.
For 24 hours format - MM/dd/yyyy HH:mm:ss tt
For 12 hours format - MM/dd/yyyy hh:mm:ss tt
There is a difference of captial and small H.
dateTimeValue.ToString(format, CultureInfo.InvariantCulture);

How do I convert a 12 hour time string into a C# TimeSpan?

When a user fills out a form, they use a dropdown to denote what time they would like to schedule the test for. This drop down contains of all times of the day in 15 minute increments in the 12 hour AM/PM form. So for example, if the user selects 4:15 pm, the server sends the string "4:15 PM" to the webserver with the form submittion.
I need to some how convert this string into a Timespan, so I can store it in my database's time field (with linq to sql).
Anyone know of a good way to convert an AM/PM time string into a timespan?

You probably want to use a DateTime instead of TimeSpan. You can use DateTime.ParseExact to parse the string into a DateTime object.
string s = "4:15 PM";
DateTime t = DateTime.ParseExact(s, "h:mm tt", CultureInfo.InvariantCulture);
//if you really need a TimeSpan this will get the time elapsed since midnight:
TimeSpan ts = t.TimeOfDay;

Easiest way is like this:
var time = "4:15 PM".ToTimeSpan();
.
This takes Phil's code and puts it in a helper method. It's trivial but it makes it a one line call:
public static class TimeSpanHelper
{
public static TimeSpan ToTimeSpan(this string timeString)
{
var dt = DateTime.ParseExact(timeString, "h:mm tt", System.Globalization.CultureInfo.InvariantCulture);
return dt.TimeOfDay;
}
}

Try this:
DateTime time;
if(DateTime.TryParse("4:15PM", out time)) {
// time.TimeOfDay will get the time
} else {
// invalid time
}

I like Lee's answer the best, but acermate would be correct if you want to use tryparse. To combine that and get timespan do:
public TimeSpan GetTimeFromString(string timeString)
{
DateTime dateWithTime = DateTime.MinValue;
DateTime.TryParse(timeString, out dateWithTime);
return dateWithTime.TimeOfDay;
}

Try:
string fromServer = <GETFROMSERVER>();
var time = DateTime.Parse(fromServer);
That gets you the time, if you create the end time as well you can get Timespans by doing arithmetic w/ DateTime objects.