from datetime import datetime

import pytz
from PIL.ExifTags import TAGS


def get_image_timestamp(img, timezone):
    exif = img._getexif()
    if not exif:
        raise ValueError("No EXIF metadata found")

    found_timestamp = None

    for (idx, tag) in TAGS.items():
        if tag == 'DateTime':
            found_timestamp = exif.get(idx)
        elif tag == 'DateTimeOriginal':
            found_timestamp = exif.get(idx)

    if found_timestamp:
        dt = datetime.strptime(found_timestamp, '%Y:%m:%d %H:%M:%S')
        tz = pytz.timezone(timezone)
        return tz.localize(dt)