Why the results of the command 'date -u' command 'date' faster than the result of 25 seconds in linux(centos 5.1)? -

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in centos release 5.10, results of command 'date -u' command 'date' faster result of 25 seconds.

here result:

[a@mg11za1 b]$ lsb_release -a  lsb version:    :core-4.0-amd64:core-4.0-ia32:core-4.0-noarch:graphics-4.0-amd64:graphics-4.0-  ia32:graphics-4.0-noarch:printing-4.0-amd64:printing-4.0-ia32:printing-4.0-noarch distributor id: centos description:    centos release 5.10 (final) release:        5.10 codename:       final [a@mg11za1 b]$ uname -a linux mg11za1 2.6.18-371.el5 #1 smp tue oct 1 08:35:08 edt 2013 x86_64 x86_64 x86_64 gnu/linux [a@mg11za1 b]$ date && date -u && /usr/sbin/hwclock --show fri jun 26 17:47:42 cst 2015 fri jun 26 09:48:07 utc 2015 fri 26 jun 2015 05:47:18 pm cst  -0.235359 seconds

and result of following code not right

#include <time.h> #include <stdio.h> int main(int argc, char** argv) {     time_t = time(null);     struct tm today;     localtime_r(&now, &today);     printf(         "seconds:%d\n"         "minutes:%d\n"         "hours:%d\n"         "day of month:%d\n"         "month:%d\n"         "year:%d\n"         "day of week:%d\n"         "day in year:%d\n"         "daylight saving time:%d\n"             ,today.tm_sec             ,today.tm_min             ,today.tm_hour             ,today.tm_mday             ,today.tm_mon             ,today.tm_year             ,today.tm_wday             ,today.tm_yday             ,today.tm_isdst);     time_t weekstart = - today.tm_wday * 24*60*60;     printf("weekstart:%u\n", (unsigned int)weekstart);     struct tm start;     localtime_r(&weekstart,&start);     start.tm_hour = 0;     start.tm_min  = 0;     start.tm_sec  = 0;     unsigned int version = mktime(&start);     printf("version:%u\n", version);     return 0; }

the result of above code is:

seconds:53 minutes:54 hours:17 day of month:26 month:5 year:115 day of week:5 day in year:176 daylight saving time:0 weekstart:1434880518 version:1434816025

the version should 1434816000 not 1434816025, (now 2015-06-26).

thanks person answer

at guess, timezone right/prc, timezone explicitly adjusted leap seconds. can see difference here:

this right/prc, not apply (current) 25 seconds time being reported:

env tz=right/prc date fri jun 26 19:13:18 cst 2015

this prc, has applied (current) 25 seconds time being reported:

env tz=prc date fri jun 26 19:13:43 cst 2015

this utc, same timezone reported date -u:

env tz=utc date fri jun 26 11:13:43 utc 2015

finally there right/utc, time without (current) 25 second adjustment:

env tz=right/utc date fri jun 26 11:13:18 utc 2015

you should not using right/ timezones general use - not match reported time producers/consumers of time.


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