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by Kenjiro Cho #07 11/28/2002

time in measurement

• absolute time
  
  
  • difference from UTC (Universal Coordinated Time)
    
    
• relative time
  
  
  • difference between events
    
    
• clock adjustment
  
  
  • clock could jump forward or backward!
    
    
  • ntp slews clock if difference is less than 128ms