ls ( –full-time option )

UNIX Command

$ls --full-time
total 4
-rw-r--r-- 1 jeffrin jeffrin 0 2012-02-19 22:30:38.000000000 +0530 a1.txt
-rw-r--r-- 1 jeffrin jeffrin 2 2012-02-19 22:31:00.000000000 +0530 a2.txt
Sat Feb 25 01:17:27 IST 2012
$date -R
Sat, 25 Feb 2012 01:19:41 +0530

UNIX Explanation

              like -l --time-style=full-iso

computer science related Theory Drop

In   computer  science  and   computer  programming,   system  time
represents a computer  system's notion of the passing  of time.  In
this sense, time also includes the passing of days on the calendar.
System  time is  measured by  a  system clock,  which is  typically
implemented  as a simple  count of  the number  of ticks  that have
transpired since  some arbitrary  starting date, called  the epoch.
For example,  Unix and  POSIX-compliant systems encode  system time
("Unix time") as  the number of seconds elapsed  since the start of
the Unix epoch  at 1 January 1970 00:00:00  UT, with exceptions for
leap seconds.

source :

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