Template:JULIANDAY

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This template computes the number of the Julian day starting at noon on the date given in parameter (in the Gregorian calendar, without any Julian correction for proleptic Gregorian dates where the calendar was not effectively applied).

The result is valid for all proleptic Gregorian calendar dates starting on March 1, 4801 BC at midnight.

Syntax:

{{JULIANDAY|year|[month]|[day]|[hour]|[minute]|[second]}}

• The year (required) must be astronomical (year=1 in 1 AD (Anno Domini), year=0 in 1 BC, year=-1 in 2 BC).
• The month (optional, default value 1) is expressed between 1 and 12 from January to December (but offsets are possible for computing other years).
• The year and month are first converted into a number of months, then rounded to the nearest integer to compute the actual year and month used for computing dates.
• The day (optional, default value 1) is normally between 1 and 31 (but offsets are possible for computing other months). Decimals are possible for fractions of day.
• The hour (optional, default value 12) is normally between 0 and 23 (but offsets are possible for computing other days). Note that Julian days begin at noon (hour = 12) and thus hours 0-11 of a solar day are one Julian day earlier than hours 12-23. The value may extend outside of the normal range and is considered as additional number of julian days (a Julian day is 24 hours or 86400 seconds exactly, ignoring any adjustment of leap seconds within the UTC calendar). Decimals are possible for fractions of hour.
• The minute and second (optional, default value 0) are normally between 0 and 59 (but offsets are possible for computing other hours). Decimals are possible for fractions of minute or second.
• All parameters can be any valid numeric expression which is evaluated before computing.

Note:

The Julian day, when computed modulo 7, grows from 0 (on Monday at noon) to 6 (on Sunday at noon)) and falls back to 0 (on next Monday). This corresponds to the order of days in the ISO week.

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