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