Decimal year calculator

`dy = decyear(v)`

dy = decyear(s,f)

dy = decyear(y,mo,d)

dy = decyear([y,mo,d])

dy = decyear(y,mo,d,h,mi,s)

dy = decyear([y,mo,d,h,mi,s])

`dy = decyear(v)`

converts
one or more date vectors, `v`

, into decimal year, `dy`

.
Input `v`

can be an `m`

-by-6 or `m`

-by-3
matrix containing `m`

full or partial date vectors,
respectively. `decyear`

returns a column vector
of `m`

decimal years.

A date vector contains six elements, specifying year, month,
day, hour, minute, and second. A partial date vector has three elements,
specifying year, month, and day. Each element of `v`

must
be a positive double-precision number.

`dy = decyear(s,f)`

converts
one or more date strings, `s`

, to decimal year, `dy`

,
using format string `f`

. `s`

can
be a character array, where each row corresponds to one date string,
or a one-dimensional cell array of strings. `decyear`

returns
a column vector of `m`

decimal years, where `m`

is
the number of strings in `s`

.

All of the date strings in `s`

must have the
same format `f`

, composed of the same date format
symbols as the `datestr`

function.
`decyear`

does not accept formats containing the
letter * Q*.

If a format does not contain enough information to compute a date number, then:

Hours, minutes, and seconds default to 0.

Days default to 1.

Months default to January.

Years default to the current year.

Date strings with two-character years are interpreted to be within 100 years of the current year.

`dy = decyear(y,mo,d)`

and `dy = decyear([y,mo,d])`

return the decimal
year for corresponding elements of the `y,mo,d`

(year,month,day)
arrays. Specify `y`

, `mo`

, and `d`

as
one-dimensional arrays of the same length or scalar values.

`dy = decyear(y,mo,d,h,mi,s)`

and `dy = decyear([y,mo,d,h,mi,s])`

return the
decimal year for corresponding elements of the `y,mo,d,h,mi,s`

(year,month,day,hour,minute,second)
arrays. Specify the six arguments as one-dimensional arrays of the
same length or scalar values.

Calculate decimal year for May 24, 2005:

dy = decyear('24-May-2005','dd-mmm-yyyy') dy = 2.0054e+003

Calculate decimal year for December 19, 2006:

dy = decyear(2006,12,19) dy = 2.0070e+003

Calculate decimal year for October 10, 2004, at 12:21:00 p.m.:

dy = decyear(2004,10,10,12,21,0) dy = 2.0048e+003

The calculation of decimal year does not take into account leap seconds.

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