import calendar
import time


def parse_timestamp(timestamp):
    """Parse a timestamp of the form "yyyy-mm-ddThh:mm:ssZ".

    Args:
        timestamp: the timestamp, as a string
    Returns:
        the number of seconds since the UNIX Epoch, as described by the timestamp
    """
    return calendar.timegm(time.strptime(timestamp, "%Y-%m-%dT%H:%M:%SZ"))