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string-format: String.format/formatted/printf cheat sheet module (specifier anatomy, rounding vs C printf, locales, Indian lakh/crore grouping Formatter cannot do, format exceptions, %t dates, concat cost), 11 contract tests

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Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_017ic4b7Sr2zcoRD2watXv1G
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Claude
2026-11-12 11:00:22 +05:30
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string-format/output/11-datetime.txt
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== %t suffixes on a LocalDateTime ==
2026-11-12 | 09:05:07 | 09:05 | 11/12/26
Thursday, 12 November 2026
09:05 AM
== the same suffixes, other locales (names are localized, numbers are not) ==
Donnerstag, 12. November 2026
jeudi 12 novembre 2026
== a LocalDate has no hour ==
IllegalFormatConversionException: H != java.time.LocalDate
== DateTimeFormatter does the same job with a reusable, immutable object ==
12 Nov 2026 09:05