def command(timebook, config, sheet, start, end, billing, format, money, **kwargs):
# get the db
cfg=parse_config(config)
db=Database(timebook, cfg)
sheet = sheet or db.get_current_sheet()
start_timestamp = parse_date_time(start) if start else None
end_timestamp = parse_date_time(end) if end else None
if billing:
if start or end:
parser.error('if you specify --billing, you cannot specify a start ' \
'or end ')
billing_time = db.get_billing_start_time(sheet)
if billing_time:
start_timestamp = billing_time
display(db, sheet, start_timestamp, end_timestamp, format, money)
