Comments on: How to use Time and Date in C http://www.codingunit.com/c-tutorial-how-to-use-time-and-date-in-c CodingUnit is your online resource for learning to program. Tutorials on C, C++, PHP, Python, MySQL, Java, JQuery, Opengl, DirectX and much more! Mon, 06 Feb 2012 06:08:16 +0000 hourly 1 http://wordpress.org/?v= By: sudheera http://www.codingunit.com/c-tutorial-how-to-use-time-and-date-in-c/comment-page-1#comment-4435 sudheera Wed, 25 Jan 2012 07:32:50 +0000 http://localhost/?p=228#comment-4435 how do i compile this... enyone send me a complie code how do i compile this… enyone send me a complie code

]]> By: munisai http://www.codingunit.com/c-tutorial-how-to-use-time-and-date-in-c/comment-page-1#comment-4373 munisai Mon, 26 Dec 2011 15:00:28 +0000 http://localhost/?p=228#comment-4373 it is really interesting.can i count the time in c that is 24hrs and after 24 hrs.A day will be incremented like that.... it is really interesting.can i count the time in c that is 24hrs and after 24 hrs.A day will be incremented like that….

]]> By: Andrew Ibbetson http://www.codingunit.com/c-tutorial-how-to-use-time-and-date-in-c/comment-page-1#comment-4337 Andrew Ibbetson Tue, 06 Dec 2011 12:19:01 +0000 http://localhost/?p=228#comment-4337 I'm currently using a combination of boland C++, ARCOM pc104 card running DOS 6.22. Within my program i have the following:- putenv("TZ=PST8PD7"); tzset(); i have also tried putenv("TZ=PST8PD7,M4.1.0/2,M11.1.0/2"); tzset(); In each case i use the localtime() function to extract the time data and display, this process seems to work fine for the zone time differrence e.g 8 hours, however the daylight saving is completely ignored. tm_isddt does indicate when daylight is in effect although this always happens at same UK start and stop time irrespective of any changes i make. question: How do i get the time to change according to specified daylight saving start, stop dates and daylight saving time differences. Many thanks in anticipation. Andy I’m currently using a combination of boland C++, ARCOM pc104 card running DOS 6.22.
Within my program i have the following:-

putenv(“TZ=PST8PD7″);
tzset();

i have also tried

putenv(“TZ=PST8PD7,M4.1.0/2,M11.1.0/2″);
tzset();

In each case i use the localtime() function to extract the time data and display, this process seems to work fine for the zone time differrence e.g 8 hours, however the daylight saving is completely ignored. tm_isddt does indicate when daylight is in effect although this always happens at same UK start and stop time irrespective of any changes i make.
question: How do i get the time to change according to specified daylight saving start, stop dates and daylight saving time differences.

Many thanks in anticipation.

Andy

]]> By: Bindi http://www.codingunit.com/c-tutorial-how-to-use-time-and-date-in-c/comment-page-1#comment-4324 Bindi Fri, 02 Dec 2011 03:17:16 +0000 http://localhost/?p=228#comment-4324 hello,i want to compare system date with another date(whole date like dd-mm-yyyy not only date) Have you any solution for this? Thanks in advance hello,i want to compare system date with another date(whole date like dd-mm-yyyy not only date)
Have you any solution for this?
Thanks in advance

]]> By: Anshuman http://www.codingunit.com/c-tutorial-how-to-use-time-and-date-in-c/comment-page-1#comment-4319 Anshuman Thu, 01 Dec 2011 17:53:51 +0000 http://localhost/?p=228#comment-4319 is it possible to calculate execution time in milliseconds or nanoseconds?how? is it possible to calculate execution time in milliseconds or nanoseconds?how?

]]> By: chithra http://www.codingunit.com/c-tutorial-how-to-use-time-and-date-in-c/comment-page-1#comment-4309 chithra Wed, 30 Nov 2011 13:26:42 +0000 http://localhost/?p=228#comment-4309 hi sir, Can i have the program for real time clock... The clock must run continuously like a wall clock... plz send me.. thank you. hi sir,
Can i have the program for real time clock…
The clock must run continuously like a wall clock…
plz send me..

thank you.

]]> By: flipps http://www.codingunit.com/c-tutorial-how-to-use-time-and-date-in-c/comment-page-1#comment-4222 flipps Fri, 18 Nov 2011 11:09:52 +0000 http://localhost/?p=228#comment-4222 Ok, figured it - if you set tm_isdst to a value that isn't you're actual daylight saving, it corrects it and adjusts the hour appropriately! Ok, figured it – if you set tm_isdst to a value that isn’t you’re actual daylight saving, it corrects it and adjusts the hour appropriately!

]]> By: flipps http://www.codingunit.com/c-tutorial-how-to-use-time-and-date-in-c/comment-page-1#comment-4221 flipps Fri, 18 Nov 2011 09:53:20 +0000 http://localhost/?p=228#comment-4221 Hi, thanks for this useful article. Tried the following snippet - after mktime() returns, it increments .tm_hour & .tm_isdst - is there any reason for this, doesn't alter the others? Could be a bit of a minefield programming the difference before and after a mktime() call... ===== str_time.tm_year = 2012-1900; str_time.tm_mon = 6; str_time.tm_mday = 5; str_time.tm_hour = 10; str_time.tm_min = 3; str_time.tm_sec = 5; str_time.tm_isdst = 0; printf("Start time year = %u\n", str_time.tm_year); printf("Start time mon = %u\n", str_time.tm_mon); printf("Start time mday = %u\n", str_time.tm_mday); printf("Start time hour = %u\n", str_time.tm_hour); printf("Start time min = %u\n", str_time.tm_min); printf("Start time sec = %u\n", str_time.tm_sec); printf("Start time isdst = %u\n", str_time.tm_isdst); time_of_day = mktime(&str_time); printf("Start time year = %u\n", str_time.tm_year); printf("Start time mon = %u\n", str_time.tm_mon); printf("Start time mday = %u\n", str_time.tm_mday); printf("Start time hour = %u\n", str_time.tm_hour); printf("Start time min = %u\n", str_time.tm_min); printf("Start time sec = %u\n", str_time.tm_sec); printf("Start time isdst = %u\n", str_time.tm_isdst); printf("Start time hour = %u\n", str_time.tm_hour); printf("%s", ctime(&time_of_day)); Hi, thanks for this useful article.
Tried the following snippet – after mktime() returns, it increments .tm_hour & .tm_isdst – is there any reason for this, doesn’t alter the others? Could be a bit of a minefield programming the difference before and after a mktime() call…
=====

str_time.tm_year = 2012-1900;
str_time.tm_mon = 6;
str_time.tm_mday = 5;
str_time.tm_hour = 10;
str_time.tm_min = 3;
str_time.tm_sec = 5;
str_time.tm_isdst = 0;

printf(“Start time year = %u\n”, str_time.tm_year);
printf(“Start time mon = %u\n”, str_time.tm_mon);
printf(“Start time mday = %u\n”, str_time.tm_mday);
printf(“Start time hour = %u\n”, str_time.tm_hour);
printf(“Start time min = %u\n”, str_time.tm_min);
printf(“Start time sec = %u\n”, str_time.tm_sec);
printf(“Start time isdst = %u\n”, str_time.tm_isdst);
time_of_day = mktime(&str_time);
printf(“Start time year = %u\n”, str_time.tm_year);
printf(“Start time mon = %u\n”, str_time.tm_mon);
printf(“Start time mday = %u\n”, str_time.tm_mday);
printf(“Start time hour = %u\n”, str_time.tm_hour);
printf(“Start time min = %u\n”, str_time.tm_min);
printf(“Start time sec = %u\n”, str_time.tm_sec);
printf(“Start time isdst = %u\n”, str_time.tm_isdst);
printf(“Start time hour = %u\n”, str_time.tm_hour);
printf(“%s”, ctime(&time_of_day));

]]> By: admin http://www.codingunit.com/c-tutorial-how-to-use-time-and-date-in-c/comment-page-1#comment-3724 admin Tue, 23 Aug 2011 05:24:13 +0000 http://localhost/?p=228#comment-3724 Don't use the methods used on this page for high resolution timing en never use wait() function (because it blocks), but instead take a look at the functions sleep() and usleep(). For delays of multiple seconds, your best bet is probably to use sleep(). For delays of at least tens of milliseconds (about 10 ms seems to be the minimum delay), usleep() should work. These functions give the CPU to other processes (``sleep''), so CPU time isn't wasted. See the manual pages sleep(3) and usleep(3) for details. But be careful with such small time delays, because they can't behave different on different operating systems. Take a look at this <a href="http://tldp.org/HOWTO/IO-Port-Programming-4.html" rel="nofollow">page</a> that has more about high resolution timing on Linux. Hope it helps! Don’t use the methods used on this page for high resolution timing en never use wait() function (because it blocks), but instead take a look at the functions sleep() and usleep(). For delays of multiple seconds, your best bet is probably to use sleep(). For delays of at least tens of milliseconds (about 10 ms seems to be the minimum delay), usleep() should work. These functions give the CPU to other processes (“sleep”), so CPU time isn’t wasted. See the manual pages sleep(3) and usleep(3) for details. But be careful with such small time delays, because they can’t behave different on different operating systems.

Take a look at this page that has more about high resolution timing on Linux.

Hope it helps!

]]> By: usha http://www.codingunit.com/c-tutorial-how-to-use-time-and-date-in-c/comment-page-1#comment-3723 usha Tue, 23 Aug 2011 04:28:51 +0000 http://localhost/?p=228#comment-3723 How to wait for milli seconds? How to wait for milli seconds?

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