[Date->JulianDay] is an accessor for getting or setting the Julian day. The Julian day number is the integer part of the Julian date, or the interval of time in days since January 1, 4713 BC Greenwich noon, Julian proleptic calendar.
Getting uses no parameters and returns the local Julian day as an integer.
Setting requires an integer parameter, and supports the =, += and -= operators. Setting modifies the date object in-place, but does not return a value.
Date Object->julianday Date Object->julianday=Integer Date Object->julianday+=Integer Date Object->julianday-=Integer
Use the [Date->JulianDay] method. The following example uses a single date object, then gets the julianday and returns its value.
Next we set the julianday field to a new value using the = operator, then set it again by adding 1 to the julianday using the += operator, and set it once more by subtracting 1 from the julianday using the -= operator. We return the result for each set operation.
local(d) = date('2011-02-21 08:00:00') #d->julianday + '<br>' #d->julianday=2455616 #d + '<br>' #d->julianday+=1 #d + '<br>' #d->julianday-=1 #d
2455614 2011-02-23 08:00:00 2011-02-24 08:00:00 2011-02-23 08:00:00
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