r.timestamp(1)

NAME
r.timestamp

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 21:54:52 +0100 (Sat, 28 Jan 2012) $

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