Python Question: Year and Day of Year to date?

Question

I have a year value and a day of year and would like to convert to a date (day/month/year).

Answer 1

The toordinal() and fromordinal() functions of the date class could be used:

from datetime import date
date.fromordinal(date(year, 1, 1).toordinal() + days - 1)

Answer 2

>>> import datetime
>>> datetime.datetime.strptime('2010 120', '%Y %j')
datetime.datetime(2010, 4, 30, 0, 0)
>>> _.strftime('%d/%m/%Y')
'30/04/2010'

Answer 3

>>>import datetime
>>>year = int(input())
>>>month = int(input())
>>>day = int(input())
data = datetime.datetime(year,month,day)
daynew = data.toordinal()
yearstart = datetime.datetime(year,1,1)
day_yearstart = yearstart.toordinal()
print ((daynew-day_yearstart)+1)

Answer 4

datetime.datetime(year, 1, 1) + datetime.timedelta(days - 1)

Answer 5

2020 Edition:

import mx.DateTime as dt 
date = dt.DateTime(yyyy,mm,dd) + dt.DateTimeDeltaFromDays(doy-1)

So, given that you know the year (say, 2020) and the doy (day of the year, say 234), then:

date = dt.DateTime(2020,1,1) + dt.DateTimeFromDays(233) 

which returns

2020-08-21 00:00:00.00