r3.timestamp map=soils date='15 sep 1987'
	  Sets the timestamp for "soils" to the single date
	  "15 sep 1987"
r3.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"
r3.timestamp map=soils date='18 feb 2005 10:30:00/20 jul 2007 20:30:00'
	  Sets the timestamp for "soils" to have the start date
	  "18 aug 2005 10:30:00" and the end date "20 jul 2007 20:30:00"
r3.timestamp map=soils date=none
	  Removes the timestamp for the "soils" 3D raster map
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)
	     minute 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
Last changed: $Date: 2015-05-11 02:16:13 +0200 (Mon, 11 May 2015) $