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EXIFTIME(1)		    General Commands Manual		   EXIFTIME(1)

NAME
       exiftime	 - display or adjust date & time Exif tags; list files ordered
       by their	Exif date & time tags

SYNOPSIS
       exiftime	[-filqw] [-s delim] [-t[acdg]] [-v[+|-]val[ymwdHMS]] file ...

DESCRIPTION
       When invoked without arguments, the exiftime utility displays the  Exif
       date and	time tags contained in each input file to the standard output.
       Otherwise, depending on the options specified, exiftime will operate on
       only  the chosen	tags, will adjust the date and time, will write	an ad-
       justed time to each file, or will list each file	in ascending order  by
       date and	time.

       Most digital cameras include one	or more	date and time tags in the Exif
       data added to the image files they produce.  These tags are:

       Image Created
	   The date and	time the image was created or changed.	 This  is  the
	   most	common tag.

       Image Generated
	   The date and	time the original image	data was generated (i.e., when
	   picture was taken).

       Image Digitized
	   The date and	time the image was stored as digital data.

       The format for these tags is "YYYY:MM:DD	HH:MM:SS" with the time	 shown
       in  24-hour  format.   The exiftime utility cannot add a	tag if it does
       not already exist in file.

       By default, exiftime will simply	print out any of the  three  date  and
       time  flags  in each input file.	 The -l	flag will produce a listing of
       each input file in date/time order, suitable for	use in	further	 image
       processing  (e.g.,  production of a Web catalog)	when filename ordering
       is not useful.

       The -v flag may be used to vary,	or adjust, dates and times.  When used
       with the	-w flag, which writes the adjusted date	and time to each input
       file, one may, for example, process a batch of files to	adjust	for  a
       camera's	incorrectly set	clock.

OPTIONS
       -f     Write  adjusted date and time tags without prompting for confir-
	      mation.

       -i     Output a prompt to standard error	before overwriting a date  and
	      time  tag	 with  the  adjusted  value.  If the response from the
	      standard input begins with 'y' or	'Y', the tag  is  overwritten.
	      This option is default behavior.

       -l     List  each  input	 file in ascending order by timestamp.	By de-
	      fault, it	uses the Image Created tag.  In	the absence of an  Im-
	      age  Created tag,	first Image Generated then Image Digitized are
	      used.  Alternatively, the	-t flag	may be	used  to  specify  the
	      timestamp	preference for ordering.  If no	date and time tags are
	      present, the OS's	epoch is used.	This flag overrides all	others
	      but the -t flag.

       -q     Do  not output details of	a date and time	adjustment to standard
	      out when using the -w flag.

       -s     Separate field name and value with the string  delim.   The  de-
	      fault is ': '.

       -t     Select  the  date	 and  time tags	for display or adjustment when
	      followed by one or more of a (all	tags), c  (Image  Created),  d
	      (Image Digitized), or g (Image Generated).

       -v     Adjust  the date and time	tags' second, minute, hour, month day,
	      week day,	month or year according	to val.	 If  val  is  preceded
	      with  a  plus  or	 minus	sign, the date is adjusted forwards or
	      backwards	according to the remaining string; otherwise the rele-
	      vant  part of the	date is	set.  The date can be adjusted as many
	      times as required	using these flags.  Flags are processed	in the
	      order given.

	      When providing an	absolute value (rather than a relative adjust-
	      ment), seconds are in the	range 0-59, minutes are	in  the	 range
	      0-59,  hours  are	in the range 0-23, month days are in the range
	      1-31, week days are in the range 0-6 (Sun-Sat),  months  are  in
	      the  range  1-12	(Jan-Dec)  and years are in the	range 80-38 or
	      1980-2038.

	      If val is	numeric, one of	either y, m, w,	d, H, M, or S must  be
	      used to specify which part of the	date is	to be adjusted.

	      The  week	day or month may be specified using a name rather than
	      a	number.	 If a name is used with	the plus (or minus) sign,  the
	      date  will be put	forwards (or backwards)	to the next (previous)
	      date that	matches	the given week day or month.   This  will  not
	      adjust  the  date, if the	given week day or month	is the same as
	      the current one.

	      When the date is adjusted	to a specific value that doesn't actu-
	      ally  exist  (for	 example  March	 26,  1:30 BST 2000 in the Eu-
	      rope/London timezone), the date will be silently	adjusted  for-
	      wards  in	units of one hour until	it reaches a valid time.  When
	      the date is adjusted to a	specific value that occurs twice  (for
	      example  October	29, 1:30 2000),	the resulting timezone will be
	      set so that the date matches the earlier of the two  times.   In
	      all cases, daylight savings time considerations are ignored.

	      Refer to the examples below for further details.

       -w     Write  the  adjusted date	and time tags.	By default, any	of the
	      three date and time tags present in the file are adjusted;  oth-
	      erwise, only those specified with	the -t flag are	adjusted.

EXAMPLES
       The command

	      exiftime example1.jpg

       will display:

	      Image Created: 2003:09:12	17:05:37
	      Image Generated: 2003:09:12 17:05:37
	      Image Digitized: 2003:09:12 17:05:37

       The command

	      exiftime -tcd example1.jpg

       will display:

	      Image Created: 2003:09:12	17:05:37
	      Image Digitized: 2003:09:12 17:05:37

       The command

	      exiftime -v+3H example1.jpg

       will adjust each	time forward by	three hours and	display:

	      Image Created: 2003:09:12	20:05:37
	      Image Generated: 2003:09:12 20:05:37
	      Image Digitized: 2003:09:12 20:05:37

       The command

	      exiftime -v+5d -v-7M -fw -tg *.jpg

       will  adjust  the  date ahead five days and the time back seven minutes
       and write the adjusted date and time to the Image Generated tag without
       a  prompt  for  confirmation for	all files that match "*.jpg".  It dis-
       plays:

	      example1.jpg:
	      Image Generated: 2003:09:12 17:05:37 -> 2003:09:17 16:58:37

	      example2.jpg:
	      Image Generated: 2004:01:22 17:07:02 -> 2004:01:27 17:00:02

       The command

	      exiftime -l -tdg *.jpg

       will list all files that	match "*.jpg",	one  per  line,	 in  ascending
       timestamp  order.  It'll	attempt	to use the following timestamp values,
       in order: Image Digitized, Image	Generated,  Image  Created,  and,  fi-
       nally, the OS's epoch.

DIAGNOSTICS
       The exiftime utility exits 0 on success and 1 if	an error occurs.

SEE ALSO
       exiftags(1), exifcom(1)

STANDARDS
       The  exiftime utility was developed using the 2003 draft	Exif standard,
       version 2.21 (http://tsc.jeita.or.jp/).

BUGS
       Does not	support	the Exif tags SubsecTime, SubsecTimeOriginal, or  Sub-
       secTimeDigitized.  Does not support manufacturer-specific date and time
       tags.

AUTHOR
       The exiftime utility and	this man page were written by Eric M. Johnston
       <emj@postal.net>.   The time adjustment functionality and documentation
       were derived from portions of FreeBSD's date(1) command by Brian	Somers
       <brian@Awfulhak.org>.

								   EXIFTIME(1)

NAME | SYNOPSIS | DESCRIPTION | OPTIONS | EXAMPLES | DIAGNOSTICS | SEE ALSO | STANDARDS | BUGS | AUTHOR

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