import pandas as pd

def load_data(file):
    if file.name.endswith(".csv"):
        df = pd.read_csv(file)
    elif file.name.endswith(".xlsx"):
        df = pd.read_excel(file)
    else:
        df = pd.read_json(file)

    df["Expiry_Date"] = pd.to_datetime(df["Expiry_Date"], errors="coerce")
    df["Purchase_Date"] = pd.to_datetime(df["Purchase_Date"], errors="coerce")

    return df