WinRT : How to convert DateTime to hstring

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WinRT : How to convert DateTime to hstring

Harshithraj1871 1,681

Hi

I was trying to make a custom CalendarDatePicker where we can pick a date from CalendarView and also modify the date manually through the keyboard.

To achieve this, I took 2 fields, one Textbox, and one CalendarDatePicker, when we pick a date from CalendarView, I want to update the date in TextBox. That is, I want to convert the DateTime returned from CalendarDatePicker.Date Property to hstring, So that I can update the date as the string in Textbox.

I was not able to find any reference for this online. It would be of great help if you could help me with this conversion.

Thank you

Viorel 122.2K Reputation points

2022-11-30T09:42:41.227+00:00

Did you try to obtain a DateTimeOffset from CalendarDatePicker.Date, then call DateTimeOffset.ToString("d")? The standard and custom parameters of ToString are explained in documentation: https://learn.microsoft.com/en-us/dotnet/api/system.datetimeoffset.tostring?view=net-7.0#system-datetimeoffset-tostring(system-string). Check if these functions are available in your environment.

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Viorel 122.2K Reputation points

2022-11-30T09:42:41.227+00:00

Did you try to obtain a DateTimeOffset from CalendarDatePicker.Date, then call DateTimeOffset.ToString("d")? The standard and custom parameters of ToString are explained in documentation: https://learn.microsoft.com/en-us/dotnet/api/system.datetimeoffset.tostring?view=net-7.0#system-datetimeoffset-tostring(system-string). Check if these functions are available in your environment.

Answer 1

Castorix31 90,191

You can use DateTimeFormatter with the format you want

For example, with a CalendarDatePicker cdp1 and a TextBox tb1 :

       DateTimeFormatter formatter(L"shortdate shorttime");  
       auto dt = formatter.Format(cdp1().Date().Value());  
       tb1().Text(dt);

Harshithraj1871 1,681 Reputation points

2022-11-30T11:16:09.117+00:00

Thank you, This was very helpful.

how can we do reverse? how can we convert a string say 1-Jan-2022 to DateTime object?

Castorix31 90,191

how can we do reverse? how can we convert a string say 1-Jan-2022 to DateTime object?

A way is with an implementation of strptime
I did a test with strptime example
then clock::from_time_t to get DateTime :

At beginning :

#include <iostream>  
#include <time.h>  
#include <iomanip>  
#include <sstream>

Test

       struct tm tm;  
       std::string dateString = "2016-04-29T00:30:29.016448Z";  
       strptime(dateString.c_str(), "%Y-%m-%dT%H:%M:%SZ", &tm);  
       time_t t = mktime(&tm);  
       auto dtDest = clock::from_time_t(t);  
       cdp1().Date(dtDest);

Harshithraj1871 1,681 Reputation points

2022-12-01T04:44:44.623+00:00

Thank you for your response, But strptime is a unix function ,Is there any c, c++ function that can be used as its replacement?
Castorix31 90,191 Reputation points

2022-12-01T06:11:57.357+00:00

But I posted the link to an implementation that I tested...
Harshithraj1871 1,681 Reputation points

2022-12-01T08:31:57.467+00:00

Oh my Bad, Thank you for your response

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WinRT : How to convert DateTime to hstring

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