NAME

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

KEYWORDS

raster, metadata, timestamp, time

SYNOPSIS

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

Flags:

--help: Print usage summary
--verbose: Verbose module output
--quiet: Quiet module output
--ui: Force launching GUI dialog

Parameters:

map=name [required]: Name of raster map
date=timestamp: Datetime, datetime1/datetime2, or ’none’ to remove
Format: ’15 jan 1994’ (absolute) or ’2 years’ (relative)

DESCRIPTION

r.timestamp has two 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 convenience, 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’

Sets the timestamp for "soils" to have the start date "18 feb 2005 10:30:00" and the end date "20 jul 2007 20:30:00".

r.timestamp map=soils date=’18 feb 2005 10:30:00/20 jul 2007 20:30:00’

Removes the timestamp for the "soils" raster map.

r.timestamp map=soils date=none

KNOWN ISSUES

Spaces in the timestamp value are required.

AUTHOR

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

SOURCE CODE

Available at: r.timestamp source code (history)

Accessed: Monday Feb 24 17:50:54 2025

GRASS 8.4.1