Track the total leap seconds added to UTC since they were introduced. Learn about time adjustments for Earth's rotation.
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Date to check leap seconds up to.
How this calculator works
Counts the cumulative leap seconds inserted into UTC since 1972 to keep atomic time aligned with Earth's rotation.
Common questions about this calculator
These calculators are for informational purposes only. While we strive for accuracy, results should not be used as the sole basis for important decisions.
