How can I apply 'date' command to specific columns, in a BASH script?

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stripchart

STRIPCHART(5)							File Formats Manual						     STRIPCHART(5)

NAME

       stripchart - draws diagrams from data with PHP

SYNOPSIS

       The script is expected to be called as a CGI script but also works from the command line.

DESCRIPTION

       Stripchart  prepares a series of diagrams directly from raw data.  It is handy for web pages that need some graphics without too much over-
       head.

OPTIONS

       -i input FILE
	      name of input data file (mandatory)

       -o output FILE
	      name of output .gif file (default: STDOUT)

       -O output FILE
	      name of output .gif file, also dumps to STDOUT

       -f from TIME
	      stripchart with data starting at TIME (default: 24 hours ago)

       -t to TIME
	      stripchart with data ending at TIME (default: now)

       -r range RANGE
	      stripchart data centered around "from" time the size of RANGE (overrides -t)

       -l last LINES
	      stripchart last number of LINES in data file (overrides -f and -t and -r)

       -T title TITLE
	      title to put on graphic (default: FILE RANGE)

       -x column X
	      time or "x" column (default: 2)

       -y column Y
	      value or "y" column (default: 3)

       -Y column Y'
	      overplot second "y" column (default: none)

       -b baseline VALUE
	      overplot baseline of arbitrary value VALUE

       -B baseline-avg
	      overrides -b, it plots baseline of computed average

       -d dump low VALUE
	      ignore data less than VALUE

       -D dump high VALUE
	      ignore data higher than VALUE

       -v verbose
	      puts verbose runtime output to STDERR

       -L log makes y axis log scale

       -c colors "COLORS"
	      set gnuplot colors for graph/axisnts/data (default: "xffffff x000000 xc0c0c0 x00a000 x0000a0 x2020c0" in	order:	bground,  axisnts,
	      grids, pointcolor1,2,3)

       -C cgi output CGI header to STDOUT if being called as CGI

       -s stats
	      turn extra plot stats on (current, avg, min, max)

       -j julian times
	      time columns is in local julian date (legacy stuff)

       -V version
	      print version number and exit

       -h help
	      display this help

NOTES

	 * TIME either unix date, julian date, or civil date in the form:
	     YYYY:MM:DD:HH:MM (year, month, day, hour, minute)
	   If you enter something with colons, it assumes it is civil date
	   If you have a decimal point, it assumes it is julian date
	   If it is an integer, it assumes it is unix date (epoch seconds)
	   If it is a negative number, it is in decimal days from current time
	     (i.e. -2.5 = two and a half days ago)
	   * All times on command line are assumed to be "local" times
	   * All times in the data file must be in unix date (epoch seconds)
	 * RANGE is given in decimal days (i.e. 1.25 = 1 day, 6 hours)
	 * if LINES == 0, (i.e. -l 0) then the whole data file is read in
	 * columns (given with -x, -y, -Y flags) start at 1
	 * titles given with -T can contain the following key words which will
	   be converted:
	     FILE - basename of input file
	     RANGE - pretty civil date range (in local time zone)
	   the default title is: FILE RANGE

AUTHORS

       Matt Lebofsky

     2.21							   November 2002						     STRIPCHART(5)

Shell Programming and Scripting