import time


def timestamp_to_time_string(t):
    """Converts a unix timestamp to a string representation of the timestamp
    Args:
        t: A unix timestamp float
    Returns
        A string representation of the timestamp
    """
    return time.strftime("%Y-%m-%dT%H:%M:%S", time.gmtime(t)) + str(t - int(t))[1:10] + 'Z'