r.timestamp

NAME

r.timestamp print/add/remove a timestamp for a raster map
(GRASS Raster Program)

SYNOPSIS

r.timestamp
r.timestamp help
r.timestamp map=name [date=timestamp],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.

EXAMPLES

r.timestamp map=soils
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 lines 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 date='15 sep 1987'
Sets the timestamp for "soils" to the single date
"15 sep 1987"

r.timestamp map=soils date='15 sep 1987,20 feb 1988'
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=none
Removes the timestamp for the "soils" raster map

COMMAND LINE OPTIONS

Parameters map: raster map name date: date/time stamp or date1,date2 range

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 as of Feb, 1996 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. Some examples will help clarify:

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) mintue is 0-59 second is 0-59.9999 (fractions of second allowed) timezone is +hhmm or -hhmm (eg, -0600)

parts can be missing

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

`BUGS`

Spaces in the timestamp value are required. AUTHOR Michael Shapiro, U.S.Army Construction Engineering Research Laboratory