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mjd - Modified Julian Day
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Calendar Description - Scheme mjd

The Modified Julian Day calendar is a variation of the Julian Astronomical Day. It is more convenient when referencing recent dates as it requires fewer digits. The day starts at midnight, in contrast to the Julian Astronomical Day where it starts at midday.

Because this calendar scheme has limited historical value, its visibility is set at hidden.

Use Case

There is no known historical use of calendar, although the Julian Day scheme, on which it is based, has been in use by the scientific community, particularly astronomers, for many years.

Definition

Days start at midnight.

The Record consists of a single Field named day.

Record
day

The Modified Julian Day calendar is equal to the Julian Day Number jdn - 2400001.

The Epoch is set at
mjdday
1
=
jdnday
2400002

Formats

The formats supplied with this scheme.

Formats - Grammar d
CodeRulePseudo:inPseudo:outExampleNote
dtextdaydddd50138D
deftextdaydddd50138H
uunit9d9d50138dH
Notes: D = Default, H = Hidden. Example based on jdn# 2450139

Script

Script - Module hics:jdn
scheme mjd { name "Modified Julian Day"; base jdn epoch:2400002; grammar d; visible no; }

It uses the grammar "d" day count definition from jdn Julian also in the module hics:jdn.

Home Development v0.3.0 Manual Hics Library mjd

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7th November 2024