app.py

import streamlit as st
from datetime import datetime

# Set the page config for the title and layout
st.set_page_config(page_title="Age Calculator", layout="centered")

# Title of the app
st.title("Age Calculator")

# Custom styles for a better look
st.markdown("""
    <style>
    .stApp {
        background-color: #f8f9fa;
        font-family: 'Arial', sans-serif;
    }
    .title {
        color: #007bff;
        font-size: 36px;
        font-weight: bold;
        text-align: center;
    }
    .container {
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        margin-top: 20px;
    }
    .form-container {
        width: 100%;
        max-width: 400px;
        padding: 20px;
        background-color: #ffffff;
        box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
        border-radius: 10px;
    }
    .error {
        color: red;
    }
    </style>
""", unsafe_allow_html=True)

# Get user input for birthdate
with st.form(key="age_calculator_form"):
    birth_date = st.date_input("Enter your birthdate", min_value=datetime(1950, 1, 1))
    submit_button = st.form_submit_button("Calculate Age")

# If form is submitted, calculate the age
if submit_button:
    try:
        # Calculate the age
        today = datetime.today()
        years = today.year - birth_date.year
        months = today.month - birth_date.month
        days = today.day - birth_date.day

        # Adjust the months and days if needed (i.e., if today is earlier than the birthdate in a given year/month)
        if months < 0:
            months += 12
            years -= 1
        if days < 0:
            # Correct the number of days by subtracting from the previous month's days
            from datetime import timedelta
            last_month = today.replace(year=today.year, month=today.month) - timedelta(days=1)
            days += last_month.day
            months -= 1
            if months < 0:
                months += 12
                years -= 1

        # Display the result
        st.success(f"You are **{years}** years, **{months}** months, and **{days}** days old!")
        st.write(f"Born on: {birth_date.strftime('%B %d, %Y')}")
    except Exception as e:
        st.error(f"Error: {str(e)}")