Does Streamlit offer a built‑in option to return timezone‑aware datetime values from its date and time widgets?

Answer: No built‑in timezone support

As of Streamlit 1.28‑1.35, st.date_input and st.time_input return naive datetime.date and datetime.time objects that reflect the browser’s local time. There is no tz or timezone parameter, and the widgets do not automatically produce timezone‑aware datetime values.

Confirmed facts from the library

• The widgets’ source code returns datetime.date and datetime.time directly.
• The public API reference shows no tz argument for either widget.
• Attempting to pass a tz keyword raises a TypeError.

How to obtain a timezone‑aware datetime yourself

1. Get the naive date and time from the widgets:

import streamlit as st
from datetime import datetime, date, time
from zoneinfo import ZoneInfo  # Python 3.9+

2. Combine them into a naive datetime:

d: date = st.date_input('Select date')
t: time = st.time_input('Select time')
naive_dt: datetime = datetime.combine(d, t)

3. Attach the desired timezone (e.g., UTC):

aware_dt: datetime = naive_dt.replace(tzinfo=ZoneInfo('UTC'))

4. Use aware_dt in your logic; ensure all datetimes in the calculation are either all naive or all aware to avoid TypeError.

Missing diagnostic detail

If you are using a Streamlit version newer than 1.35, please confirm the exact version, as a future release could introduce a tz parameter that would change the recommendation.