jday man page on DragonFly
[printable version]
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
astronomical julian dates, and julian dates to calendar dates. There
is a corresponding 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 sys‐
tem.
-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 © 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
disclaimer.
Redistributions in binary form must reproduce the
above copyright notice, this list of conditions and the follow‐
ing disclaimer in the documentation and/or other materials pro‐
vided 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 per‐
mission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER‐
CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DIS‐
CLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEM‐
PLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
OR PROFITS; OR BUSINESS INTERRUPTION) 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)
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