The normal `date` command is helpful here:
```
$ date --iso-8601=seconds
2025-07-19T12:22:56-06:00

$ date --iso-8601=seconds --date='last monday'
2025-07-14T00:00:00-06:00

$ date --iso-8601=seconds --date='last monday - 1 week'
2025-07-07T00:00:00-06:00
```


Given that, here's a "what did we finish last week" command:
```
$ ent list state=done done-time=$(date --iso-8601=seconds --date='last monday - 1 week')..$(date --iso-8601=seconds --date='last monday')
failed to parse issue 87fa3146b90db61c4ea0de182798a0e5, skipping
ignoring error: StdIoError(Os { code: 21, kind: IsADirectory, message: "Is a directory" })
Done:
8c73c9fd5bc4f551ee5069035ae6e866       migrate the Todo list into entomologist
75cefad80aacbf23fc7b9c24a75aa236  🗨️ 4  # implement `ent comment ISSUE [DESCRIPTION]` (👉 seb)
7da3bd5b72de0a05936b094db5d24304  🗨️ 1  implement `ent edit ${COMMENT}` (👉 seb)
198a7d56a19f0579fbc04f2ee9cc234f       fix ignoring unknown file in issues directory: "README.md"
e089400e8a9e11fe9bf10d50b2f889d7       add `ent sync` to keep local `entomologist-data` branch in sync with remote
a26da230276d317e85f9fcca41c19d2e       `ent edit ${ISSUE}` with no change fails (👉 seb)
317ea8ccac1d414cde55771321bdec30  🗨️ 2  allow multiple read-only ent processes simultaneously (👉 seb)
da435e5e298b28dc223f9dcfe62a9140       add user control over state transitions (👉 lex)
fd81241f795333b64e7911cfb1b57c8f       commit messages in the `entomologist-data` branch could be better (👉 seb)
093e87e8049b93bfa2d8fcd544cae75f       add optional 'assignee' to issue (👉 seb)
793bda8b9726b0336d97e856895907f8       `ent list` should have a consistent sort order (👉 seb)
af53c561b36e9b2709b939f81daee534       use git author info to attribute issues and comments to people (👉 seb)
9e69a30ad6965d7488514584c97ac63c       teach `ent list FILTER` to filter by assignee (👉 seb)
a5ac277614ea4d13f78031abb25ea7d6       `ent new` and `ent comment`: detect empty issue descriptions & comments (👉 seb)
7d2d236668872cf11f167ac0462f8751  🗨️ 1  add `ent tag ISSUE [[-]TAG]` (👉 seb)
54f0eb67b05aa10763c86869ce840f33       `ent sync` should report what changes got fetched & what changes will be pushed (👉 seb)
4e314a8590864fa76d22758e1785ae35       don't spawn an editor if stdin & stdout aren't a terminal (👉 seb)
d3a705245bd69aa56524b80b5ae0bc26  🗨️ 1  move IssuesDatabase out of binary and into library (👉 sigil-03)
```