NAME

       plconfigtime  -  Configure  the  transformation  between  continuous and broken-down time for the current
       stream

SYNOPSIS

       plconfigtime(scale, offset1, offset2, ccontrol, ifbtime_offset, year, month, day, hour, min, sec)

DESCRIPTION

       Configure the transformation between continuous and  broken-down  time  for  the  current  stream.   This
       transformation is used by both plbtime(3plplot) and plctime(3plplot).

       Redacted form: General: plconfigtime(scale, offset1, offset2, ccontrol, ifbtime_offset, year, month, day,
       hour, min, sec)

       This function is used in example 29.

ARGUMENTS

       scale (PLFLT(3plplot), input)
              The  number  of  days per continuous time unit.  As a special case, if scale is 0., then all other
              arguments are ignored, and the result (the default used by PLplot) is the equivalent of a call  to
              plconfigtime(1./86400.,  0.,  0.,  0x0,  1,  1970, 0, 1, 0, 0, 0.). That is, for this special case
              broken-down time is calculated  with  the  proleptic  Gregorian  calendar  with  no  leap  seconds
              inserted,  and  the  continuous  time  is defined as the number of seconds since the Unix epoch of
              1970-01-01T00:00:00Z.

       offset1 (PLFLT(3plplot), input)
              If ifbtime_offset is true, the parameters offset1 and offset2 are completely  ignored.  Otherwise,
              the sum of these parameters (with units in days) specify the epoch of the continuous time relative
              to  the  MJD  epoch  corresponding  to the Gregorian calendar date of 1858-11-17T00:00:00Z or JD =
              2400000.5.  Two PLFLT numbers are used to specify the origin to allow users (by specifying offset1
              as an integer that can be exactly represented by a floating-point variable and specifying  offset2
              as  a  number  in  the  range  from  0.  to  1) the chance to minimize the numerical errors of the
              continuous time representation.

       offset2 (PLFLT(3plplot), input)
              See documentation of offset1.

       ccontrol (PLINT(3plplot), input)
              ccontrol contains bits controlling the transformation.  If the 0x1 bit is set, then the  proleptic
              Julian calendar is used for broken-down time rather than the proleptic Gregorian calendar.  If the
              0x2 bit is set, then leap seconds that have been historically used to define UTC are inserted into
              the  broken-down  time. Other possibilities for additional control bits for ccontrol exist such as
              making the historical time corrections in the broken-down  time  corresponding  to  ET  (ephemeris
              time)  or  making  the (slightly non-constant) corrections from international atomic time (TAI) to
              what astronomers define as terrestrial time (TT).  But those  additional  possibilities  have  not
              been implemented yet in the qsastime library (one of the PLplot utility libraries).

       ifbtime_offset (PLBOOL(3plplot), input)
              ifbtime_offset  controls  how  the epoch of the continuous time scale is specified by the user. If
              ifbtime_offset is false, then offset1 and offset2 are used to specify the epoch, and the following
              broken-down time parameters are completely ignored.  If ifbtime_offset is true, then  offset1  and
              offset2  are completely ignored, and the following broken-down time parameters are used to specify
              the epoch.

       year (PLINT(3plplot), input)
              Year of epoch.

       month (PLINT(3plplot), input)
              Month of epoch in range from 0 (January) to 11 (December).

       day (PLINT(3plplot), input)
              Day of epoch in range from 1 to 31.

       hour (PLINT(3plplot), input)
              Hour of epoch in range from 0 to 23

       min (PLINT(3plplot), input)
              Minute of epoch in range from 0 to 59.

       sec (PLFLT(3plplot), input)
              Second of epoch in range from 0. to 60.

AUTHORS

       Many developers (who are credited at http://plplot.org/credits.php) have contributed to PLplot  over  its
       long history.

SEE ALSO

       PLplot documentation at http://plplot.org/documentation.php.

                                                  October, 2024                            PLCONFIGTIME(3plplot)