decyear

Decimal year calculator

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Syntax

dy = decyear(datetime)

dy = decyear(dateVector)

dy = decyear(dateCharacterVector,format)

dy = decyear(year,month,day)

dy = decyear([year,month,day])

dy = decyear(year,month,day,hour,minute,second)

dy = decyear([year,month,day,hour,minute,second])

Description

example

dy= decyear(datetime)converts one or moredatetimearrays to decimal year,dy.

dy= decyear(dateVector)converts one or more date vectors,dateVector, into decimal year,dy.

dy= decyear(dateCharacterVector,format)converts one or more date character vectors,dateCharacterVector, to decimal year using formatformat.

example

dy= decyear(year,month,day)anddy= decyear([year,month,day])return the decimal year for corresponding elements of theyear,month,dayarrays.

dy= decyear(year,month,day,hour,minute,second)anddy= decyear([year,month,day,hour,minute,second])return the decimal year for corresponding elements of theyear,month,day,hour,minute,secondarrays. Specify the six arguments as one-dimensional arrays of the same length or as scalar values.

Examples

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Calculate Decimal Year Using`datetime`Array

Calculate the decimal year for February 4, 2016 fromdatetimearray.

dt = datetime('04-02-2016',“InputFormat”,'dd-MM-yyyy') dy = decyear(dt)

dt = datetime 04-Feb-2016 dy = 2.0161e+03

Calculate Decimal Year Using Data Character Vector and`dd-mm-yyyy`Format

Calculate decimal year for May 24, 2005 using data character vector anddd-mm-yyyyformat.

dy = decyear('24-May-2005','dd-mmm-yyyy')

dy = 2.0054e+03

Calculate Decimal Year Using Year, Month, and Day Inputs

Calculate the decimal year for December 19, 2006 from year, month, and day inputs.

dy = decyear(2006,12,19)

dy = 2.0070e+003

Calculate Decimal Year from Year, Month, Day, Hour, Minute, and Second Inputs

Calculate the decimal year for October 10, 2004, at 12:21:00 p.m. from year, month, day, hour, month, and second inputs:

dy = decyear(2004,10,10,12,21,0)

dy = 2.0048e+003

Input Arguments

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`datetime`—`datetime`array
m-by-1 array|1-by-marray

datetimearray, specified as anm-by-1 array or 1-by-marray.

`dateVector`—Full or partial date vector
m-by-6 matrix|m3 matrix|positive double-precision number

Full or partial date vector, specified as anm-by-6 orm3 matrix containingmfull or partial date vectors, respectively:

Full date vector — Contains six elements specifying the year, month, day, hour, minute, and second
Partial date vector — Contains three elements specifying the year, month, and day

Data Types:double

`dateCharacterVector`—Date character vector
character array|one-dimensional cell array of character vectors

Date character vector, specified as a character array, where each row corresponds to one date, or a one-dimensional cell array of character vectors.

Data Types:char|string

`format`—Date format
`-1`(default) |character vector|string scalar|integer

日期格式,specified as a character vector, string scalar, or integer. All dates indateCharacterVectormust have the same format and use the same date format symbols as thedatenumfunction.

decyeardoes not accept formats containing the letterQ.

Ifformatdoes not contain enough information to compute a date number, then:

Hours, minutes, and seconds default to 0.
天默认为1。
Months default to January.
Years default to the current year.

Data Types:char|string