[SGVLUG] timediff - ISO 8601

[Robert Leyva]

Yep, that's why my timediff program spews which date format it requires :)

void usage() {
[...]
  printf("%s [options] date1 date2 \n",PROGRAM_NAME);
  printf("\n");
  printf("where \n");
  printf("\n");
  printf("dates are in ISO 8601 format and are after 1800 A.D. \n");
  printf("(http://en.wikipedia.org/wiki/ISO_8601) \n");
  printf("(basically yyyy-mm-dd) \n");
  printf("\n");
  [...]
  printf(" -d days **default** \n");
  printf("\n");
  exit(1);
}


> I wrote this several years ago.  It is not a trivial problem due to
> all the various date formats in common use.
>
> For example, what date is this?:  04-05-11
>
> Matt
>
> Hint:  Think European
>
> On Wed, Jan 5, 2011 at 1:51 AM, Claude Felizardo <cafelizardo at gmail.com>
> wrote:
>> Cool.
>> Actually I could use a program to calculate the diff given time stamps
>> from say syslog or what ever.  It would be nice if it could various
>> formats with optional date and/or time components and calculate the
>> difference and printing the diff in either seconds or hh:mm:ss, etc.
>> For example, I might want want to be able to cut and paste the time
>> stamps to find the interval between two or more events in
>> /var/log/messages
>>
>> timediff Jan  5 01:45:01 01:47:35
>>
>> Note how I have left off the date component of the 2nd datetime.
>> It would return the difference in both mm:ss and well as total seconds.
>>
>> Bonus if it could handle more than two datetime on the command line or
>> possibly read from stdin calculating the diff between each entry until
>> end of file.
>>
>> claude
>>
>>
>>
>> On Tue, Jan 4, 2011 at 9:38 PM, juanslayton @dslextreme.com
>> <juanslayton at dslextreme.com> wrote:
>>> You put it up on Savannah yet?
>>> John
>>>
>>> On Tue, Jan 4, 2011 at 8:34 PM, Robert Leyva <mrflash818 at geophile.net>
>>> wrote:
>>>>
>>>> A C-language program of something simple, and fun, to calculate the
>>>> difference between two dates, for using in a shell script, for example
>>>> :)
>>>>
>>>> http://mrflash818.geophile.net/php/clang/index.php
>>>>  ...and...
>>>> http://mrflash818.livejournal.com/108407.html
>>>>
>>>> I created it because I wanted to figure out some quick averages for
>>>> kWh
>>>> consumption, but could not find a simple preexisting program that does
>>>> differences in time as a command line and stand alone program.
>>>>
>>>>
>>>> --
>>>> "Knowledge is Power" -- Francis Bacon
>>>>
>>>> Robert Leyva
>>>> mrflash818 at geophile.net
>>>>
>>>>
>>>
>>>
>>
>
>
>
> --
> Matthew Campbell | Chief Technical Officer
> Imagination Games
> 3450 Cahuenga Blvd. West #103
> Los Angeles, CA  90068
> 818.314.9897 (M)
> matt.campbell at imaginationgames.com
> www.imaginationgames.com
>


-- 
"Knowledge is Power" -- Francis Bacon

Robert Leyva
mrflash818 at geophile.net