[yamilmaud]

Resolves #725.

"decade" was already supported; this adds the other two words from the issue, for English only.

New words

Unit	Words	Meaning
fortnight	fortnight, fortnights	2 weeks
century	century, centuries	100 years

CLDR has no data for these words (it has no decade, century or fortnight field), so they are added to the supplementary English YAML and en.py is regenerated from it.

Supported phrases

Form	Fortnight	Century
Number plus unit	2 fortnights, a fortnight	2 centuries, a century
Past	2 fortnights ago, a fortnight ago	2 centuries ago, a century ago
Future	in a fortnight, in 2 fortnights	in a century, in two centuries
Relative	last fortnight, this fortnight, next fortnight	last century, this century, next century
Later	a fortnight later, two fortnights later	a century later, 2 centuries later
From now	a fortnight from now	2 centuries from now
Combined	1 fortnight 3 days ago	1 century 2 decades ago

These also work with number words (two), decimals (1.5 centuries ago), signs (+1 century) and a trailing time (in a fortnight at 5pm).

Other changes

• from now / in for decades: a decade from now and in 1 decade resolved to the past, because the in was dropped. Decade, fortnight and century are now in the unit list of Locale._clear_future_words, so these resolve to the future.
• Ordinal guard: 20th century, the 21st century, 1st century and 2nd fortnight return None. Without the guard the ordinal suffix is a skip word, so 20th century was read as 20 centuries ago (and search_dates read "in the 20th century" as year 4026).

Not covered

• Bare fortnight ago (no number) and in a fortnight's time, which also fail for week and decade.

• half a century ago.

• this century and this fortnight resolve to the past, matching the existing this decade.

• Ordinals before the older units (3rd decade, 3rd week) are still read as relative dates, as before.

• Languages other than English.

• I have read the contributing guide and set up pre-commit.

🤖 Generated with Claude Code

[codspeed]

Merging this PR will not alter performance

✅ 7 untouched benchmarks

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_{Comparing yamilmaud:fix_DC-1342_Add_support_for_decade_fortnight_century (8b3b8f7) with master (fed9cf9)}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.97%. Comparing base (fed9cf9) to head (8b3b8f7).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1539   +/-   ##
=======================================
  Coverage   98.96%   98.97%           
=======================================
  Files         239      239           
  Lines        3592     3594    +2     
=======================================
+ Hits         3555     3557    +2     
  Misses         37       37           

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[serhii73]

Reviewed the diff and ran the full suite on this branch merged with current master (24809 passed); CI is green. The century and fortnight handling folds into years and weeks consistently, and the ordinal guard (20th century) is covered by tests.