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SUBROUTINE sla_KBJ (JB, E, K, J)
*+
* - - - -
* K B J
* - - - -
*
* Select epoch prefix 'B' or 'J'
*
* Given:
* JB int sla_DBJIN prefix status: 0=none, 1='B', 2='J'
* E dp epoch - Besselian or Julian
*
* Returned:
* K char 'B' or 'J'
* J int status: 0=OK
*
* If JB=0, B is assumed for E < 1984D0, otherwise J.
*
* P.T.Wallace Starlink 31 July 1989
*
* Copyright (C) 1995 Rutherford Appleton Laboratory
*
* License:
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program (see SLA_CONDITIONS); if not, write to the
* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307 USA
*
*-
IMPLICIT NONE
INTEGER JB
DOUBLE PRECISION E
CHARACTER K*(*)
INTEGER J
* Preset status
J=0
* If prefix given expressly, use it
IF (JB.EQ.1) THEN
K='B'
ELSE IF (JB.EQ.2) THEN
K='J'
* If no prefix, examine the epoch
ELSE IF (JB.EQ.0) THEN
* If epoch is pre-1984.0, assume Besselian; otherwise Julian
IF (E.LT.1984D0) THEN
K='B'
ELSE
K='J'
END IF
* If illegal prefix, return error status
ELSE
K=' '
J=1
END IF
END