from datetime import datetime


def is_older(issue_date, time_gap):
    """Assess if the issue is older than a defined time gap.

    Return True if the date is older.
    time_gap is defined as a datetime object.
    """
    older = False
    created = datetime.strptime(issue_date, "%Y-%m-%dT%H:%M:%SZ")
    if created < time_gap:
        older = True
    return older