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Calender Program in C Programming Language: Display Day of the month Calender Program in C Programming Language: Program will accept Year,Month and Date from the user and will display the day of the month.

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I have something like this:

It prints the current day and time in the stdout, but I want to get this output or assign them to the current_day and current_time variables, so that I can do some processing with those values later on.

The only solution that I can think of now is to direct the output to some file, and then read the file and then assign the values of date and time to current_day and current_time. But I think this is not a good way. Is there any other short and elegant way?

Ciro Santilli 新疆改造中心996ICU六四事件seg.server.faultseg.server.fault

9 Answers

JiminionAdam RosenfieldAdam Rosenfield

You can also use strftime to format the time into a string.

SнаđошƒаӽMartin BeckettMartin Beckett

strftime (C89)

Martin mentioned it, here's an example:

main.c

GitHub upstream.

Compile and run:

Sample output:

The %c specifier produces the same format as ctime.

One advantage of this function is that it returns the number of bytes written, allowing for better error control in case the generated string is too long:

RETURN VALUE

asctime and ctime (C89)

asctime is a convenient way to format a struct tm:

main.c

Sample output:

And there is also ctime() which the standard says is a shortcut for:

As mentioned by Jonathan Leffler, the format has the shortcoming of not having timezone information.

POSIX 7 marked those functions as 'obsolescent' so they could be removed in future versions:

The standard developers decided to mark the asctime() and asctime_r() functions obsolescent even though asctime() is in the ISO C standard due to the possibility of buffer overflow. The ISO C standard also provides the strftime() function which can be used to avoid these problems.

C++ version of this question: How to get current time and date in C++?

Tested in Ubuntu 16.04.

Ciro Santilli 新疆改造中心996ICU六四事件Ciro Santilli 新疆改造中心996ICU六四事件

The answers given above are good CRT answers, but if you want you can also use the Win32 solution to this. It's almost identical but IMO if you're programming for Windows you might as well just use its API (dunno if you are programming in windows actually but whatever)

Anyway, this is your windows solution. Hope it'll prove helpful for you sometime!

Timespec has day of year built in.

To expand on the answer by Ori Osherov

You can use the WinAPI to get the date and time, this method is specific to Windows, but if you are targeting Windows only, or are already using the WinAPI then this is definitly a possibility¹:

You can get both the time and date by using the SYSTEMTIMEstruct. You also need to call one of two functions (either GetLocalTime() or GetSystemTime()) to fill out the struct.

GetLocalTime() will give you the time and date specific to your time zone.

GetSystemTime() will give you the time and date in UTC.

The SYSTEMTIMEstruct has the following members:

wYear, wMonth, wDayOfWeek, wDay, wHour, wMinute, wSecond and wMilliseconds

You then need to just access the struct in the regular way

Actual example code:

(Coded for simplicity and clarity, see the original answer for a better formatted method)

The output will be something like this:

Useful References:

All the WinAPI documentation (most already listed above):

An extremely good beginners tutorial on this subject by Zetcode:

Simple operations with datetime on Codeproject:

1: As mentioned in the comments in Ori Osherov's answer ('Given that OP started with date +%F, they're almost certainly not using Windows. – melpomene Sep 9 at 22:17') the OP is not using Windows, however since this question has no platform specific tag (nor does it mention anywhere that the answer should be for that particular system), and is one of the top results when Googling 'get time in c' both answers belong here, some users searching for an answer to this question may be on Windows and therefore will be useful to them.

SimonSimon

instead of files use pipes and if u wana use C and not C++ u can use popen like this

and use *fp as a normal file pointer with fgets and all

if u wana use c++ strings, fork a child, invoke the command and then pipe it to the parent.

// make a similar 1 for date +T but really i recommend u stick with stuff in time.h GL

I'm getting the following error when compiling Adam Rosenfield's code on Windows.It turns out few things are missing from the code.

Error (Before)

Solution

Compiling

Final Output

I hope this will helps others too

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C Program to Implement Calender Program to display Day of the month

Pooja

Calender Program in C Programming Language : Display Day of the month

Calender Program in C Programming Language :

Program will accept Year,Month and Date from the user and will display the day of the month.

Print Next Date C Png

Print Next Date C Code

2 4	Enter the month02 Date:29/2/2012