NAME

       r.timestamp  - Modifies a timestamp for a raster map.
       Print/add/remove a timestamp for a raster map.

KEYWORDS

       raster, metadata, timestamp

SYNOPSIS

       r.timestamp
       r.timestamp help
       r.timestamp map=name  [date=timestamp]   [--verbose]  [--quiet]

   Parameters:
       map=name
           Name of input raster map

       date=timestamp
           Datetime, datetime1/datetime2, or 'none' to remove
           Format: '15 jan 1994' (absolute) or '2 years' (relative)

DESCRIPTION

       This  command  has 2 modes of operation. If no date argument is supplied, then the current
       timestamp for the raster map is printed.  If  a  date  argument  is  specified,  then  the
       timestamp for the raster map is set to the specified date(s). See examples below.

NOTES

       Strings  containing  spaces  should  be  quoted.  For  specifying a range of time, the two
       timestamps should be separated by a forward slash. To remove the timestamp from  a  raster
       map, use date=none.

TIMESTAMP FORMAT

       The  timestamp  values must use the format as described in the GRASS Datetime Library. The
       source tree for this library should have a description of the format. For  convience,  the
       formats are reproduced here:

       There are two types of datetime values:
       absolute and relative.
       Absolute values specify exact dates and/or times. Relative values specify a span of time.

   Absolute
       The general format for absolute values is:
         day month year [bc] hour:minute:seconds timezone
                 day is 1-31
                 month is jan,feb,...,dec
                 year is 4 digit year
                 [bc] if present, indicates dates is BC
                 hour is 0-23 (24 hour clock)
                 minute is 0-59
                 second is 0-59.9999 (fractions of second allowed)
                 timezone is +hhmm or -hhmm (eg, -0600)
        Some parts can be missing, for example
                 1994 [bc]
                 Jan 1994 [bc]
                 15 jan 1000 [bc]
                 15 jan 1994 [bc] 10 [+0000]
                 15 jan 1994 [bc] 10:00 [+0100]
                 15 jan 1994 [bc] 10:00:23.34 [-0500]

   Relative
       There  are  two  types of relative datetime values, year-month and day-second. The formats
       are:
                 [-] # years # months
                 [-] # days # hours # minutes # seconds
        The words years, months, days, hours, minutes, seconds are literal words, and the  #  are
       the numeric values. Examples:
                 2 years
                 5 months
                 2 years 5 months
                 100 days
                 15 hours 25 minutes 35.34 seconds
                 100 days 25 minutes
                 1000 hours 35.34 seconds
         The following are illegal because it mixes year-month and day-second (because the number
       of days in a month or in a year vary):
                 3 months 15 days
                 3 years 10 days

EXAMPLES

       Prints the timestamp for the "soils" raster map. If there is  no  timestamp  for  "soils",
       nothing  is  printed.  If  there  is  a  timestamp,  one  or two time strings are printed,
       depending on if the timestamp for the map consists of a single date or two dates (ie start
       and end dates).
           r.timestamp map=soils
        Sets the timestamp for "soils" to the single date "15 sep 1987".
           r.timestamp map=soils date='15 sep 1987'
         Sets the timestamp for "soils" to have the start date "15 sep 1987" and the end date "20
       feb 1988".
           r.timestamp map=soils date='15 sep 1987/20 feb 1988'
        Removes the timestamp for the "soils" raster map.
           r.timestamp map=soils date=none

BUGS

       Spaces in the timestamp value are required.

SEE ALSO

        r.info

AUTHOR

       Michael Shapiro, U.S.Army Construction Engineering Research Laboratory

       Last changed: $Date: 2012-01-28 12:54:52 -0800 (Sat, 28 Jan 2012) $

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