This site provides Highlights released in the past.

May 31, 2011   About renewal of certificates(IMPORTANT) TimeStamp Service down time: July 19, 2011, 12:30 to 12:55 p.m. (JST) TimeStamp Service down time: August 1, 2011, 12:30 to 12:55 p.m. (JST) *Rescheduled due to renewal of certificates(7/11/11) *Please note that you will need to download a root certificate. March 31, 2011   Suspension of the Service upon rolling blackouts March 16, 2011   Suspension of the Service upon rolling blackouts March 14, 2011   Service regular stop due to further improvement of reliability TimeStamp Service down time : April 15, 2011, 12:50 to 12:55 p.m. (JST) TimeStamp Service down time : May 16, 2011, 12:50 to 12:55 p.m. (JST) TimeStamp Service down time : June 15, 2011, 12:50 to 12:55 p.m. (JST) TimeStamp Service down time: July 19, 2011, 12:50 to 12:55 p.m. (JST)(Rescheduled) TimeStamp Service down time : August 17, 2011, 12:50 to 12:55 p.m. (JST) TimeStamp Service down time : September 15, 2011, 12:50 to 12:55 p.m. (JST) TimeStamp Service down time : October 14, 2011, 12:50 to 12:55 p.m. (JST) TimeStamp Service down time : November 15, 2011, 12:50 to 12:55 p.m. (JST) TimeStamp Service down time : December 15, 2011, 12:50 to 12:55 p.m. (JST) TimeStamp Service down time : January 13, 2012, 12:50 to 12:55 p.m. (JST) TimeStamp Service down time : February 15, 2012, 12:50 to 12:55 p.m. (JST) TimeStamp Service down time : March 15, 2012, 12:50 to 12:55 p.m. (JST) Attention: Time Stamps cannot be issued during the period above. June 29, 2010   About renewal of certificates (Valid until maintenance on August 1, 2011) TimeStamp Service down time: July 20, 2011, 12:30 to 12:55 p.m. (JST) Please note that you will need to download a root certificate and an intermediate certificate. July 9, 2009   Service temporary stop due to further improvement of reliability(Completed) TimeStamp Service down time: July 23, 2009, 10:00 to 10:05 a.m. and 14:00 to 14:05 p.m. about one or two minutes. (JST) January 20, 2009   Service temporary stop due to further improvement of reliability(Completed) TimeStamp Service down time: January 29, 2009, 5:00 a.m. to 6:00 a.m. about one or two minutes. (JST) January 2, 2009   APOLOGY for delay of resumption December 12, 2008   Service temporary stop due to insertion of leap seconds and further improvement of reliability(Completed) TimeStamp Service down time : January 1, 2009, 5:00 a.m. to 11:00 p.m.(JST)