method modified-julian-date
Documentation for method modified-julian-date
assembled from the following types:
class DateTime
From DateTime
(DateTime) method modified-julian-date
Defined as:
method modified-julian-date(DateTime: --> Real)
Returns the Modified Julian Date (MJD) for the UTC date and time.
say DateTime.new('2021-12-24T12:23:00.43Z').modified-julian-date; # OUTPUT: «59572.5159772»
Notice the fractional part of the modified-julian-date
is same value as the day-fraction
for the same instant. Likewise, the integral part of the MJD is the same value as the daycount
for the same instant since they reference the same epoch (November 17, 1858). The MJD is obtained by subtracting the constant 2_400_000.5
from the Julian Date and is used to simplify transformations between civil and astronomical time systems.