Masterclock manufactures a variety of timing PCIe cards to provide millisecond synchronization accuracy for your server or PC. Options for our timing cards include; extended temperature range, TCXO and OCXO time bases, and multiple input/output codes such as time code input from GPS, IRIG-B, SMPTE, EBU and IRIG-B12.
Since we started adding Leap Seconds in 1972, there have been 26 of them - with the 27th to follow at 11:59:59 p.m. UTC (6:59:59 p.m. ET) on Dec. 31, 2016. The most recent addition occurred on June 30, 2015, which was the first since 2012 and the second since 2008. None were added from 1999-2004, but one was added every year with only five exceptions from 1973-95.