JDAY(1) 2.4 JDAY(1) NAME jday, j2d - astronomical julian date conversion utilities SYNOPSIS jday jday [-d [-]year-mm-dd hh:mm:ss] jday [--version] jday [--h[elp]] j2d <julian decimal date> j2d [--version] j2d [--h[elp]] DESCRIPTION jday and j2d are command line utilities to convert calendar dates to astro- nomical julian dates, and julian dates to calendar dates. There is a cor- responding library libjday.a which can be used for the same functionality within applications. OPTIONS jday accepts the following options: none at all jday will simply print out the julian date based on the date and time found on the system. [year [month [day [hour [minute [second]]]]]] Always in that order, to override that value found on the system. -d [-]year-mm-dd hh:mm:ss Specify a year in the same format as that printed out by j2d j2d accepts the following options: <julian decimal date> This is the only, and required argument to j2d both commands accept the following options: --version Display the version of the programs. --h[elp] Display a command help message EXAMPLES $ jday 1970 1 1 12 0 0 2440588.000000 $ jday 0 1 1 12 0 0 1721058.000000 $ jday -4712 1 1 12 0 0 0.000000 $ jday -d -4712-01-01 12:00:00 0.000000 $ j2d 0.0 -4712-01-01 12:00:00 $ j2d 1721058.0 0-01-01 12:00:00 $ j2d 2440588.0 1970-01-01 12:00:00 SEE ALSO Time Standard: http://tycho.usno.navy.mil Systems of time: http://tycho.usno.navy.mil/systime.html COPYRIGHT Copyright (C) 1986-2005, Hiram Clawson jday at hiram.ws All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: Redistributions of source code must retain the above copyright notice, this list of conditions and the following dis- claimer. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. Neither name of The Museum of Hiram nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, IN- CLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY DI- RECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS IN- TERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. Version 10 October 2005 JDAY(1)
NAME | SYNOPSIS | DESCRIPTION | OPTIONS | EXAMPLES | SEE ALSO | COPYRIGHT
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