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performance(chrono): use write! macro to improve date formatting #617

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performance(chrono): use write! macro to improve date formatting #617

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@fvaleye fvaleye commented Oct 30, 2025

Description

Replace formatter-based string construction with manual formatting using String::with_capacity and write! across chrono ToSql implementations. This reduces allocations and formatter overhead on hot paths.

Local benchmark with my laptop

Type Before (format) After (write + capacity) Speedup Improvement
NaiveDate::to_sql 112.9 ns 53.6 ns 2.11x 111% faster
NaiveTime::to_sql 174.1 ns 119.0 ns 1.46x 46% faster
NaiveDateTime::to_sql 229.1 ns 154.0 ns 1.49x 49% faster

@fvaleye
performance(chrono): pre-allocate string capacity and use write! macr…
83edb52 
…o for better performance

Signed-off-by: Florian Valeye <[email protected]>
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