The zero point for TimeFrame axis values TimeOrigin
Besselian Epoch: Expressed in decimal years, with or without decimal places ("
B1950"
or "
B1976.13"
for example).
Julian Epoch: Expressed in decimal years, with or without decimal places ("
J2000"
or "
J2100.9"
for example).
Units: An unqualified decimal value is interpreted as a value in the system specified
by the TimeFrame’
s System attribute, in the units given by the TimeFrame’
s Unit
attribute. Alternatively, an appropriate unit string can be appended to the end of the
floating point value ("
123.4 d"
for example), in which case the supplied value is
scaled into the units specified by the Unit attribute.
Julian Date: With or without decimal places ("
JD 2454321.9"
for example).
Modified Julian Date: With or without decimal places ("
MJD 54321.4"
for example).
Gregorian Calendar Date: With the month expressed either as an integer or a 3-character
abbreviation, and with optional decimal places to represent a fraction of a day ("
1996-10-2"
or "
1996-Oct-2.6"
for example). If no fractional part of a day is given,
the time refers to the start of the day (zero hours).
Gregorian Date and Time: Any calendar date (as above) but with a fraction of a day
expressed as hours, minutes and seconds ("
1996-Oct-2 12:13:56.985"
for example). The
date and time can be separated by a space or by a "
T"
(as used by ISO8601 format).
’
s System, in the unit specified by the
TimeFrame’
s Unit attribute.