string
A user-defined format for date/time output. This format is used when the date mode (set by the numeric identifier date_mode) has the value 9.
The format is of the form used by the C function strftime. The following table is an extract from the Sun/Solaris documentation for strftime, and the meanings and availability may vary for other systems. The relative C language documentation should be consulted for a definitive description.
|  
       Primer  | 
    
       Meaning  | 
  
%%  | 
    same as %  | 
  
| 
 %a  | 
    
 locale's abbreviated weekday name  | 
  
%A  | 
    locale's full weekday name  | 
  
%b  | 
    locale's abbreviated month name  | 
  
%B  | 
    locale's full month name  | 
  
| 
 %c  | 
    
 locale's appropriate date and time representation  | 
  
%C  | 
    
       * locale's date and time representation as produced by date(1)  | 
  
%d  | 
    day of month [1,31]; single digits are preceded by 0  | 
  
%D  | 
    * date as %m/%d/%y  | 
  
%e  | 
    * day of month [1,31]; single digits are preceded by a space  | 
  
%h  | 
    * locale's abbreviated month name  | 
  
%H  | 
    hour (24-hour clock) [0,23]; single digits are preceded by 0  | 
  
%I  | 
    hour (12-hour clock) [1,12]; single digits are preceded by 0  | 
  
%j  | 
    day number of year [1,366]; single digits are preceded by 0 | 
%k  | 
    
       * hour (24-hour clock) [0,23]; single digits are preceded by a blank  | 
  
%l  | 
    * hour (12-hour clock) [1,12]; single digits are preceded by a blank | 
%m  | 
    month number [1,12]; single digits are preceded by 0  | 
  
%M  | 
    minute [00,59]; leading zero is permitted but not required  | 
  
%n  | 
    * insert a newline  | 
  
%p  | 
    locale's equivalent of either a.m. or p.m.  | 
  
%r  | 
    * appropriate time representation in 12-hour clock format with %p  | 
  
%R  | 
    * time as %H:%M  | 
  
%S  | 
    seconds [00,59]  | 
  
%t  | 
    * insert a tab  | 
  
%T  | 
    * time as %H:%M:%S  | 
  
%u  | 
    * weekday as a decimal number [1,7], with 1 representing Sunday  | 
  
%U  | 
    
       week number of year as a decimal number [00,53], with Sunday as the first day of week 1  | 
  
%V  | 
    * week number of the year as a decimal number [01,53], with Monday as the first day of the week. If the  | 
  
%w  | 
    weekday as a decimal number [0,6], with 0 representing Sunday  | 
  
%W  | 
    week number of year as a decimal number [00,53], with Monday as the first day of week 1  | 
  
%x  | 
    locale's appropriate date representation  | 
  
%X  | 
    
       locale's appropriate time representation  | 
  
%y  | 
    year within century [00,99]  | 
  
%Y  | 
    year, including the century (for example 1993)  | 
  
%Z  | 
    time zone name or abbreviation, or no bytes if no time zone information exists  | 
  
* Note: This primer is not available on Microsoft Windows systems