[issue44610] Format issue with strftime and %Y

[Bartosz Kaznowski]

New submission from Bartosz Kaznowski :

When you convert a date pre the year 1000 to a string with `%Y` as the 
formatter and then back to a date again then it fails. This is because `%Y` 
expects it to be formatted with leading zeroes. For example, the year 1/01/01 
(/mm/dd) should be 0001/01/01 when formatting using %Y/%m/%d. However, %Y 
returns 1.
You can see this in action here:

from datetime import date, datetime
format = "%Y-%m-%d"
formatted = date.min.strftime("%Y-%m-%d")
datetime.strptime(formatted, format).date()

`ValueError: time data '1-01-01' does not match format '%Y-%m-%d'` is raised on 
the forth line.

--
components: Library (Lib)
messages: 397329
nosy: bkaznowski
priority: normal
severity: normal
status: open
title: Format issue with strftime and %Y
type: behavior
versions: Python 3.7

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[issue44610] Format issue with strftime and %Y

[Bartosz Kaznowski]

Change by Bartosz Kaznowski :


--
versions: +Python 3.9 -Python 3.7

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[issue44610] Format issue with strftime and %Y

[Bartosz Kaznowski]

Change by Bartosz Kaznowski :


--
versions: +Python 3.10, Python 3.6, Python 3.7, Python 3.8

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[issue44610] Format issue with strftime and %Y

[Bartosz Kaznowski]

Bartosz Kaznowski  added the comment:

Ok, thanks @iritkatriel. I have closed it as a duplicate.

I did notice after posting this that in the cpython source code people work 
around this issue. Now I can see why.

I guess I will just have to work around this issue too. Luckily it doesn't 
cause too many problems for what I need.

Thanks!

--
resolution:  -> duplicate
stage:  -> resolved
status: open -> closed

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