CODEWITHSUNDEEP
pythondatetimedecimal
hrishi
hrishi

Reputation: 443

decimal years to datetime in python

I have been using a function to convert datetime objects to decimal years based on this post python how to convert datetime dates to decimal years but I was unable to find any post showing the inverse: decimal years to datetime objects. Any help in this regard is appreciated.

thanks,

Upvotes: 7

Views: 8990

Answers (3)

Eye4got
Eye4got

Reputation: 29

I found defining a 'base' and calculating down to the second level was unnecssary as the same accuracy seems to be preserved just by using days. I believe this response is less verbose.

datetime(int(x), 1, 1) + timedelta(days = (x % 1) * 365)

The above 365 can easily be replaced with @PaulMcGuire's recommendation, adapted for days.

Upvotes: 1

Jon Clements
Jon Clements

Reputation: 142226

Not properly tested, but looks about right:

from datetime import datetime, timedelta

start = 2012.5
year = int(start)
rem = start - year

base = datetime(year, 1, 1)
result = base + timedelta(seconds=(base.replace(year=base.year + 1) - base).total_seconds() * rem)
# 2012-07-02 00:00:00

Upvotes: 10

Hyperboreus
Hyperboreus

Reputation: 32449

What I would do is the following:

Split the decimal year into its integer and fractional part.

Create a datetime object for the 1st of January of the year = integer of decimal year.

Convert the fractional part to seconds.

Add a timedelta(seconds=...) to the datetime object.

Upvotes: 0

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