Hi everyone,

I’m trying to deploy a FastAPI application on Railway, but I’m encountering issues with setting the Italian locale (it_IT.UTF-8). My goal is to ensure that date formats are displayed correctly in Italian.

Here’s what I’ve tried so far in my Dockerfile:

FROM python:3.9-slim

Install locales

RUN apt-get update && apt-get install -y locales && \
echo "itIT.UTF-8 UTF-8" > /etc/locale.gen && \ locale-gen itIT.UTF-8

WORKDIR /app

COPY requirements.txt /app/requirements.txt
RUN pip install --no-cache-dir -r requirements.txt

COPY . /app

EXPOSE 8000

ENV LANG=itIT.UTF-8 ENV LANGUAGE=itIT:it
ENV LCALL=itIT.UTF-8

CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8000"]

and in my main.py:

from fastapi import FastAPI
from datetime import datetime
import locale

app = FastAPI()

locale.setlocale(locale.LCTIME, 'itIT.UTF-8')

@app.get("/")
def read_root():
return {"message": "Hello World"}

@app.get("/convert-date/{datestr}") def convertdate(datestr: str): try: dateobj = datetime.strptime(datestr, "%d-%m-%Y") formatteddate = dateobj.strftime("Oggi è il %d %B %Y") return {"message": formatteddate}
except ValueError:
return {"error": "Formato data non valido. Usa il formato dd-mm-yyyy."}

Despite these settings, the deployment fails to configure the locale correctly, and I’m unable to achieve the desired date formatting in Italian. The application works locally on my development machine, but I can’t seem to get it running properly on Railway.

Has anyone successfully configured a non-default locale in Docker for a Railway deployment? Any help or suggestions would be greatly appreciated.

Thank you!

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