A Fast 64-Bit Date Algorithm (30–40% faster by counting dates backwards)
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informative
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positive
Category
tech_discussion
Key topics
Date Algorithms
Optimization
Programming
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Nov 22, 2025 at 9:27 PM EST
1d ago
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Nov 22, 2025 at 9:27 PM EST
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Nov 22, 2025 at 9:27 PM EST
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It achieves a 30–40% speed improvement on x86-64 and ARM64 (Apple M4 Pro) by reversing the direction of the year count and reducing the operation count (4 multiplications instead of the usual 7+).
Paper-style explanation, benchmarks on multiple architectures, and full open-source C++ implementation.
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