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day-fraction
Combined from primary sources listed below.

In DateTime§

See primary documentation in context for method day-fraction. 

method day-fraction(DateTime:D: --> Real:D)

Returns the instant's time as a fraction of a 24-hour day.

say DateTime.new('2021-12-24T12:23:00.43Z').day-fraction; # OUTPUT: «0.5159772␤»

Notice the day-fraction value is the same as the fractional part of the modified-julian-date for the same instant.

Also note that leap seconds may cause some variations from expected values:

for 30, 31 { say DateTime.new(2016,12,$_,12,0,0).day-fraction }
# OUTPUT: «0.5␤0.499994␤»

Available as of the 2021.04 Rakudo compiler release.