| Year_Day | R Documentation | 
Regularly spaced year plus day of year. This year day format is commonly used in NASS Ocean Color product
Year_Day(...)
| ... | Arguments passed to  | 
| from | starting date, required. | 
| to | end date, optional. If supplied, to must be after (later than) from. | 
| by | a character string, containing one of "sec", "min", "hour", "day", "week", "month" or "year". This can optionally be preceded by an integer and a space, or followed by "s". character string "quarter" that is equivalent to "3 months". A number, taken to be in seconds. A object of class 'difftime' | 
This function's Arguments follow timeSequence
a numeric vector of year plus day of year
Chih-Lin Wei <chihlinwei@gmail.com>
Year_Day("1998-01-01", "1999-12-01", by="month")
LazyData: true
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