[verse]
__YYYY__-__MM__-__DD__ __HH__:__II__[:__SS__[.__NANO__]]
__HH__:__II__[:__SS__[.__NANO__]]
$$[$$-]__SEC__[.__NANO__]

'YYYY'::
    4-digit year.

'MM'::
    2-digit month (January is `01`).

'DD'::
    2-digit day.

'HH'::
    2-digit hour (24-hour format).

'II'::
    2-digit minute.

'SS'::
    2-digit second.

'NANO'::
    Nanoseconds (up to nine digits).

'SEC'::
    Seconds since origin.