Report - NIST Time and Frequency Bulletin: December · 2021. 1. 15. · No leap second will be added at the end of December 2020. Positive leap seconds, beginning at 23 h 59 min 60 s UTC and

Select PornographicDefamatoryIllegal/UnlawfulSpamOther Terms Of Service ViolationFile a copyright complaint

Please pass captcha verification before submit form