Test of Time: Rethinking Temporal Signal of Benchmark Contamination. - Terry Jingchen Zhang; Gopal Dev; Ning Wang; Max Obreiter; Wenyuan Jiang; Punya Syon Pandey; Keenan Samway; Yinya Huang; Bernhard Schölkopf; Mrinmaya Sachan; Zhijing Jin 001 (ACL (1), 2026)