Module clock 

UTC timestamps in the one format the store round-trips.

Atoms compare timestamps as strings, so the format has to sort the way the instants do: fixed width, milliseconds, Z. A shorter or longer fraction sorts wrong against what is already on disk.

Functions

canonicalize

Rewrite any stamp parse_millis accepts into the store form.

elapsed_days

Days between two stored timestamps, floored at zero.

format_millis

Milliseconds since the epoch, formatted as YYYY-MM-DDTHH:MM:SS.mmmZ.

parse_millis

Parse a stored timestamp back to milliseconds since the epoch.

shift

A stored timestamp shifted by whole seconds, in the same format.

utcnow

Now, in the store’s format.