Provided by: exiftags_1.01-7_amd64 bug


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


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


       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  adjusted  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

       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.


       -f     Write adjusted date and time tags without prompting for confirmation.

       -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  default,  it  uses  the
              Image  Created  tag.  In the absence of an Image 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 default 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

       -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
              relevant 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 adjustment), 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 actually exist (for
              example March 26, 1:30 BST 2000 in the Europe/London timezone), the  date  will  be
              silently  adjusted  forwards  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; otherwise, only those specified with the  -t
              flag are adjusted.


       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 displays:

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

              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, finally, the OS's epoch.


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


       exiftags(1), exifcom(1)


       The  exiftime  utility  was  developed  using  the  2003 draft Exif standard, version 2.21


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


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