hello i'm new to programming i have the following problem
string tt = drpPickuptime.SelectedItem.Text;
DateTime mora = Convert.ToDateTime(tt);
I have also tried this
string tt = drpPickuptime.SelectedItem.Text;
DateTime mora = DateTime.Parse(tt, new CultureInfo("fr-FR")).Date;
and this 1 also
DateTime mora = DateTime.ParseExact(drpPickuptime.SelectedItem.Text, "mm", CultureInfo.CurrentCulture);
but the error is nor rectified. The problem is that i have a combobox and i have put just minuts there which will be selected by user. I want to store that value in database. But in database the data type of that field is datetime. When i change that to string the problem is solved. But isn't it possible to store that string in database with required conditions. Though it is not a good question but i have done my all effort on it and could;nt get the result. Can anyone help me please
The problem is that you cannot create a valid DateTime with just minutes, there needs to be a date (year, month, day).
If you are just storing minutes in the database then I would recommend an int type. If you really must have a DateTime then you will need to store a date too, perhaps Today's date is an option? in which case you can do this:
int minutes = int.Parse(drpPickuptime.SelectedItem.Text);
DateTime dt = DateTime.Today.AddMinutes(minutes);
I think the best would be to change the datatype to bigint, and store it as a timespan. You can store the Ticks property of the timespan in the database, then when you bring it back you just do TimeSpan.FromTicks(database field). And to store it you can do TimeSpan.FromMinutes(your comobobox value), you will have to parse the combobox value to an integer.
You can't store minutes as a DateTime in the database, as #Jon mentioned. You'd have to store the value as an integer. Then if you want to apply those minutes to some date value, you could do:
DateTime d = DateTime.Now.AddMinutes(tt);
or if you want those minutes in the past you could do:
DateTime d = DateTime.Now.AddMinutes(tt * -1);
You could also store it in the database as a string. Then in your code you can do an int.Parse to convert it from a string to an integer.
Related
I have the following simple example:
string dt = DateTime.Now.ToString("yyyy-MM-dd hh.mm.ss");
I can't change the DateTime.Now, but I can change datetime format yyyy-MM-dd hh.mm.ss. Following this example the result must be today's date, but I need to get yesterday's date with the same parameters except day (year, month, hours, minutes and seconds). E.g. 2015-08-23 12.09.59 must be 2015-08-22 12.09.59. So is it possible to use some "-" operator or something else inside the datetime format to achieve the result?
If you want yesterday's date, you can do this
string dt = DateTime.Now.AddDays(-1).ToString("yyyy-MM-dd hh.mm.ss");
DateTime.AddDays() lets you add number of days, positive for future date, negative for past date.
E.g. 2015-08-23 12.09.59 must be 2015-08-22 12.09.59. So is it
possible to use some "-" operator or something else inside the
datetime format to achieve the result?
No, it's not possible inside the DateTime format. you can not change any thing. Because it is only for define format of the Date to display in string format. Any addition or subtraction can only be done before converting it to string format as suggested by "Arghya C".
Can you explain your limitation so we can solve your problem.
If you can only influence the date time pattern, than use the roundtrip format and parse the returning string back to a date time, add the calculation and format it into the desired format:
var dateTimeString = badLibrary.GetDateTime("o");
var dateTime = DateTime.Parse(dateTimeString, null, DateTimeStyles.RoundtripKind);
var newDateTime = dateTime.AddDays(-1);
return newDateTime.ToString("yyyy-MM-dd hh.mm.ss");
I have to convert this time format string (20130221191038.576375+330) to normal datetime through c# classes like datetime.
please share the idea to convert this..
Thanks guys, I got the solution for my requirement with the help of Erik,tung and BlackHatShadow.
Referred this
this also
The format you have is a CIM_DATETIME value, which is almost simple to parse. The only problem is that it specifies the timezone as an offset in number of minutes.
You can use the DateTime.TryParseExact to convert the portion of the string prior to the timezone specifier, then subtract the timezone value (in minutes) from the result to get the UTC datetime. Then you can convert to local time if you need, or leave it in UTC form.
public static DateTime? CIMToUTCDateTime(string CIM_DATETIME)
{
// CIM_DATETIME must be 25 characters in length
if (string.IsNullOrEmpty(CIM_DATETIME) || CIM_DATETIME.Length != 25)
return null;
// Get the datetime portion of the string without timezone offset
string dtPortion = CIM_DATETIME.Substring(0, 21);
// convert to datetime
DateTime dt;
if (!DateTime.TryParseExact(dtPortion, "yyyyMMddHHmmss.ffffff", System.Globalization.DateTimeFormatInfo.InvariantInfo, System.Globalization.DateTimeStyles.AssumeUniversal | System.Globalization.DateTimeStyles.AdjustToUniversal, out dt))
return null;
// subtract timezone offset to get UTC time equivalent
int tzoffset;
if (!Int32.TryParse(CIM_DATETIME.Substring(21), out tzoffset))
return null;
dt = dt.AddMinutes(-tzoffset);
// return UTC datetime
return dt;
}
And now that I've written this horrid little method, you've gone and found another solution. Typical :P
I know you already found a solution, but I came across this nice ManagementDateTimeConverter .Net class that does exactly what you want. All you need to do is:
// This gets converted to your local time
DateTime converted = ManagementDateTimeConverter.ToDateTime("20130221191038.576375+330")
// If you want the UTC equivalent:
converted.ToUniversalTime()
As the title said I am bringing in a date string from a datatable with the format of "d-MMM-yy" or 27-AUG-06.
I need to convert it to a date type for sorting, but I need to keep the same format for display.
NOTE: I am using C#, .Net 2.0, and I am retyping this code so bear with me on typos
System.Globalization.DateTimeFormatInfo dtfi;
dtfi = new System.Globalization.DateTimeFormatInfo();
dtfi.ShortDatePattern = "d-MMM-yy";
dtfi.DateSeperator = "-";
//this is in a for loop with rowCnt being the row index/counter: loop and datatable is working fine.
//"newRow" represents a DataRow in the new table.
// the table [row] [column] is bringing in the string date like "27-AUG-06"
//colXDate IS RECORDED AS {8/27/2006 12:00:00 AM}
DateTime colXDate = DateTime.ParseExact(inputDataTable.Rows[rowCnt]["colX"].ToString(), "d-MMM-yy", System.Globalization.CultureInfo.InvariantCulture);
//#### THIS NEXT LINE IS WHERE IT GIVES ME AN ERROR "String was not recognized as valid datetime."
newRow["colX"] = Convert.ToDateTime(colXDate.ToString(), dtfi);
Since you already have colXDate as a DateTime, you don't need to convert it to a string and then back into a datetime.
Instead, try this:
newRow["colX"] = colXDate.ToString("d-MMM-yy");
Your line fails because ToString() will output the date in the format defined in the current culture and you are trying to convert it back to a date using your custom date format.
You need to set it to colXDate.ToString("d-MMM-yy").
SCENARIO: I am passing a datatable back as a DataGrids datasource. I am passing in a string field that is a date. I want to convert it to a date so that I can sort by it but I also want to maintain the same format that it was on the string that came in.
ISSUE: From some of my research it seems that the DateTime type is exactly that a datatype in whatever datatable that you put it in and is not formatable. So even though I bring in an unormal string date and convert it to a datetime via the DateTime.ParseExact, when I put it into my datetime field and try to format it (newRow["colX"] = colXDate.ToString("d-MMM-yy"); //as Scott had above) it still goes in as a set datetime format with hours...etc.
SOLUTION: So I resolved this by smoke and mirrors. I put 2 columns in the datatable, the first being the string format display date and the second the datetime type. On ItemDataBound I hid the datetime column (e.Item.Cells[5].Visible = false;) and then on the sort event I test for string date column (e.SortExpression == "colX") and if it is true I sort by the hidden datetime column.
I am working with an old mysql database in which a date is stored (without a time) as a datetime and a time is stored as a string (without a date).
In C# I then have a DateTime with a value like 2010-06-25 12:00:00 AM and a String with a value like 15:02.
What is the most concise way to combine these without a lot of overhead?
I have tried a few methods including:
DateTime NewDateTime = DateTime.Parse(OldDateTime.ToString("yyyy-MM-dd ") + TimeString);
I dislike converting the existing DateTime to a string and appending the time.
I can convert the time string to a date, but then I get today's date and adding it as a number of ticks to the old datetime is incorrect.
Note: Don't worry about validation, it is done elsewhere. The time is represented using 24-hour format without seconds.
You can use TimeSpan.Parse to parse the time, and then add the result to the date:
DateTime newDateTime = oldDateTime.Add(TimeSpan.Parse(timeString));
var dt = new DateTime(2010, 06, 26); // time is zero by default
var tm = TimeSpan.Parse("01:16:50");
var fullDt = dt + tm; // 2010-06-26 01:16:50
I used something similar to what simendsjo says, except I continued to have it as a DateTime
DateTime date = Convert.ToDateTime(txtTrainDate.Text);
DateTime time = Convert.ToDateTime(ddTrainTime.SelectedValue);
DateTime dtCOMPLTDTTM = new DateTime(date.Year, date.Month, date.Day, time.Hour, time.Minute, time.Second);
I think you're worrying about the string conversion too much. By combining the 2 string elements together you are saving further date string parsing anyway which will most likely be more expensive.
Is this going to be repeated a lot of times or a simple step in a larger process?
I am fairly sure you could combine and convert these values into a timestamp using SQL.
This line
System.DateTime.Parse("09/12/2009");
convert date (string) to 9/12/2009 12:00:00 AM. How can I get a date in the form 9/12/2009.
after explanations I do:
DateTime dt = System.DateTime.Parse(Request.Form["datepicker"]);
dt.ToString("dd/mm/yyyy");
/* and this code have time, why???*/
Your problem is not with the parsing but with the output. Look at how ToString works for DateTime, or use this example:
using System;
class Program
{
static void Main(string[] args)
{
DateTime dt = DateTime.Parse("09/12/2009");
Console.WriteLine(dt.ToString("dd/MM/yyyy"));
}
}
Or to get something in your locale:
Console.WriteLine(dt.ToShortDateString());
Update: Your update to the question implies that you do not understand fully my answer yet, so I'll add a little more explanation. There is no Date in .NET - there is only DateTime. If you want to represent a date in .NET, you do so by storing the time midnight at the start of that day. The time must always be stored, even if you don't need it. You cannot remove it. The important point is that when you display this DateTime to a user, you only show them the Date part.
Anything parsed to a DateTime object will contain date+time. If no time is sepcified, the assumed value will be 0000hr.
To get the date-only representation, it's up to how you format it to string.
E.g. theDate.ToString("dd/MM/yyyy")
Refer to the MSDN Date and Time Format Strings.
if you want to convert gridview datetime column to date only column use this code :
raddgvDaybook.Rows.ToList().ForEach(x =>
{
DateTime dt = DateTime.Parse(x.Cells["Vocdate"].Value.ToString());
string str = string.Format("{0:MM/dd/yyyy}", dt);
x.Cells["Vocdate"].Value = str;
});
I tested the code it will work if you bind the datetime as string in dgv.