Leap Second Time Adjustment Day

Leap Second Time Adjustment Day has always been observed annually on June 30.

Leap Second Time Adjustment DayImage: Google Image

When is Leap Second Time Adjustment Day?

  • Leap Second Time Adjustment Day 2017 is observed on Friday, June 30, 2017
  • Leap Second Time Adjustment Day 2018 is observed on Saturday, June 30, 2018
  • Leap Second Time Adjustment Day 2019 is observed on Sunday, June 30, 2019
  • Leap Second Time Adjustment Day 2020 is observed on Tuesday, June 30, 2020

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