We Keep Coding

Iterating through a DateTime in MMM yyyy format

I have a couple of DateTime startTime and endTime. I would like them to be in MMM yyyy format ("August 2017") but if I parse them ToString, i can't loop because, well, it's a string now, there is no AddMonths method. For exemple :
var formattedStartTime = startTime.ToString("MMMM yyyy");
var formattedEndTime = endTime.ToString("MMMM yyyy");
for (var date = formattedStartTime; date < formattedEndTime; date = date.AddMonths(1)) // nope
How can i parse my variables and loop through every month in between two dates ?

By calling ToString you are obviously converting your dates to a string, which know nothing about the original date they represent and as such also cannot perform any date related operations.
The solution is to simply convert to string only when you are actually displaying the object:
for (var date = startTime; date < endTime; date = date.AddMonths(1))
{
Console.WriteLine(date.ToString("MMM yyyy"));
}
Be careful with such date comparisons though, since depending on the actual days of the month and the time component in the startTime and endTime, you might skip or include a result you do not expect.
For example with startTime = new DateTime(2017, 1, 2) and endTime = new DateTime(2017, 2, 3) (February 3rd), you would get February in the result but with endTime = new DateTime(2017, 2, 1) (February 1st) you wouldn’t.

How to select a from date and End date from DateTimePicker...I have a following code

I'm using DateTimePicker control and the following code which shows a present DateTime when I select it from the picker. I need that whatever DateTime I've selected it'll shows that only, not the present.
I am displaying it on the next page...
DateTime DateFrom = DateTime.Now;
DateTime DateTo = DateTime.now;
DateTime.TryParse(datetimepicker.Value, CultureInfo.InvariantCulture, DateTimeStyles.AdjustToUniversal, out DateFrom);
DateTime.TryParse(datetimepicker.Value, CultureInfo.InvariantCulture, DateTimeStyles.AdjustToUniversal, out DateTo);

Your Question is very unclear but it is clear that your not very familiar with how .net works
so here are a few examples that might highlight what you are misunderstanding
how to set the date of a picker
datetimepicker.Value = yourDateTime
how to get the date from a picker
yourDateTime = datetimepicker.Value
how to set the date range that is valid for selection
datetimepicker.MaxDate = yourMaxDate;
datetimepicker.MinDate = yourMinDate;
how to turn a string into a date
DateTime tmp;
if(DateTime.TryParse(yourString, out tmp))
yourdatetime = tmp
How to display a non editable date
label.Text = yourDateTime.ToShortDateString()
how to select a date range, either use 2 DateTimePickers or a MonthCalendar
How to remove a Timezone from the date
yourUTCDate = yourDate.ToUniversalTime()

Try this one:
DateTime DateFrom = DateTime.Now;
DateTime DateTo = DateTime.Now;
DateTime.TryParse(datetimepicker1.Value.ToString(), CultureInfo.InvariantCulture, DateTimeStyles.AdjustToUniversal, out DateFrom);
DateTime.TryParse(datetimepicker2.Value.ToString(), CultureInfo.InvariantCulture, DateTimeStyles.AdjustToUniversal, out DateTo);

How to split string value using c# asp.net

I want to split this 2015-08-11 10:59:41.830 value which is in datetime datatype format and convert it to the following format using c# asp.net.
August 11, 45 minutes ago
The given datetime(i.e-2015-08-11 10:59:41.830) will compare with the current datetime and display like the above format.Please help me to do this.

You will need to parse your date using DateTime.Parse(string s) and once you have that, you take the current date (DateTime.Now) and subtract from it the parsed date.
This should yield a TimeSpan struct. Assuming that both of the dates will refer to the same date, you can then construct your string by taking the pieces you need from the parsed date (Day and Month) and from the time span (Hours, minutes and seconds).

For your specific format you can try ParseExact() "yyyy-MM-dd HH:mm:ss.fff"
static void Main(string[] args)
{
//Given that previous and and now is the same day
DateTime previous = DateTime.ParseExact("2015-08-18 10:59:41.830", "yyyy-MM-dd HH:mm:ss.fff",
System.Globalization.CultureInfo.InvariantCulture);
DateTime now = DateTime.Now;
double value = now.Subtract(previous).TotalMinutes;
Console.WriteLine(string.Format("{0:MMMM dd}, {1} minutes ago", now, (int)value));
Console.ReadLine();
}

npinti already explained it, here the code part;
string s = "2015-08-18 10:59:41.830";
DateTime dt;
if(DateTime.TryParseExact(s, "yyyy-MM-dd HH:mm:ss.fff", CultureInfo.InvariantCulture,
DateTimeStyles.None, out dt))
{
var ts = dt - DateTime.Now;
Console.WriteLine("{0}, {1} minutes ago",
dt.ToString("MMMM dd", CultureInfo.InvariantCulture),
ts.Minutes);
}
I run this code 2015-08-18 09:50 in my local time and it's generate August 18, 9 minutes ago as a result.
Remember, Minutes property represents minute component of the TimeSpan object and it's range is from -59 to 59. If you wanna get all minutes based on TimeSpan object value, you can use TotalMinutes property (or even as (int)ts.TotalMinutes).

You need this
var yourString = "2015-08-11 10:59:41.830";
var oldDate = DateTime.ParseExact(yourString, "yyyy-MM-dd hh:mm:ss.fff", CultureInfo.InvariantCulture);
//The above two steps are only for if you have date in `string` type, but if you have date in `DateTime` format then skip these.
var difference = DateTime.Now - oldDate;
//here old date is parsed from string or your date in `DateTime` format
var result = string.Format("{0:MMMM dd}, {1} minutes ago", oldDate, difference.Minutes);

Join date and time in c#

I have a win form c# SQL app that stores date in one column and time in the another.
There is only one date time picker on my form and I want to display both date and time values (which are from two separate columns)..
So far this is what I've done
Datetime final = datetime. Parse exact (date + " " + time , "MM/dd/yyyy hh:mm tt", cultureinfo. Invariant culture);
But it throws " string was not recognized as valid datetime" exception on the above line.

If date and time are DateTime variables, you can combine them with date arithmetic:
DateTime date=...;
DateTime time = ...;
DateTime finalDate = date.Date + time.TimeOfDay;
If they are strings, you can parse them to DateTime and TimeSpan variables:
DateTime date=DateTime.ParseExact(dateString,dateFormat,CultureInfo.InvariantCulture);
TimeSpan time = TimeSpan.ParseExact(timeString,timeFormat,CultureInfo.InvariantCulture);
DateTime finalDate = date.Date + time;
This is possible because you can add a DateTime and a TimeSpan value to get a new DateTime value

You can use TimeSpan.Parse to parse
DateTime newDateTime = date.Add(TimeSpan.Parse(time));

string d = DateTime.Now.Date.ToString("dd/MM/yyyy");
string t = DateTime.Now.ToString("h:mm");
var ts = TimeSpan.ParseExact(t, #"h\:mm",CultureInfo.InvariantCulture);
DateTime result = DateTime.ParseExact(d, "dd/MM/yyyy", CultureInfo.InvariantCulture)+ts;
Hope this helps,
Thanks.

How to get differences of dates

I am making a web page in that I have used Ajax calendar to pick two date like TO date and From date and I also have a Textbox of total days.
So when user selects to and from dates, the difference of these dates is displayed in the textbox. So how can I find the difference of these dates..?
I set the format like dd/MM/yyyy.
e.g.
one textbox has: 20/04/2012
second has : 02/05/2012
So, please find difference on these ?
Thanks in Advance....
Mitesh

Substraction operator (-) works on DateTime
DateTime to_datetime = DateTime.ParseExact(to_textbox.Text, "dd/MM/yyyy",
CultureInfo.InvariantCulture);
DateTime from_datetime = DateTime.ParseExact(from_textbox.Text, "dd/MM/yyyy",
CultureInfo.InvariantCulture);
Timespan result = to_datetime - from_datetime;
You can use it as
textBox1.Text = (to_datetime - from_datetime).TotalDays.ToString();

Convert your textbox values to date using:
DateTime dt1 = DateTime.ParseExact(textbox1.Text, "d/M/yyyy", CultureInfo.InvariantCulture);
DateTime dt2 = DateTime.ParseExact(textbox2.Text, "d/M/yyyy", CultureInfo.InvariantCulture);
Use TimeSpane
TimeSpan ts = dt1.Subtract(dt2);
Console.Write(ts.TotalDays);
textBox3.Text = ts.TotalDays;

Assuming C# code: DateTime support "-" that results in TimeSpan object.
DateTime nowTime = DateTime.Now;
DateTime yesterday = nowTime.AddDay(-1);
TimeSpan diff = nowTime - yesterday;

DateTime date1 =DateTime.ParseExact("20/04/2012","d/M/yyyy",null);
DateTime date2 = DateTime.ParseExact("02/05/2012", "d/M/yyyy", null);
TimeSpan datediff = date2 - date1;
Response.Write(datediff.ToString());