SQLite timestamps with floating point seconds

Today I learned about this:

select strftime('%Y-%m-%dT%H:%M:%f')

Which outputs:


Note the seconds component which reads 25.087 - that's what you get from the %f format string.

This is useful because it provides a string which captures timestamp information at the millisecond level but can still be sorted alphabetically to sort by date.

I spotted this in the SQL schema for goqite by Markus Wüstenberg, who uses it for recording created and updated timestamps:

create table goqite (
  id text primary key default ('m_' || lower(hex(randomblob(16)))),
  created text not null default (strftime('%Y-%m-%dT%H:%M:%fZ')),
  updated text not null default (strftime('%Y-%m-%dT%H:%M:%fZ')),
  queue text not null,
  body blob not null,
  timeout text not null default (strftime('%Y-%m-%dT%H:%M:%fZ')),
  received integer not null default 0
) strict;

create trigger goqite_updated_timestamp after update on goqite begin
  update goqite set updated = strftime('%Y-%m-%dT%H:%M:%fZ') where id = old.id;

Another neat trick in that schema:

select lower(hex(randomblob(16)))

Which returns random strings like this one, suitable for use as IDs:


Created 2024-03-13T21:29:04-07:00 · Edit