Kirana, P.K.C. et al. 2026. Location Validation and Server Time Synchronization for iOS-Based Attendance to Mitigate ASN Fraud in Lamongan. Journal of Advanced Vocational Information and Communication Technology. 1, 3 (Sep. 2026), 29–42. DOI:https://doi.org/10.52158/javict.v1i3.1687.