Jesus 'n Jim

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I have a new digital watch that's off by 40sec in 3 days. cr2025 battery is supposed to last 10 years

watch off-by x, extend to y

your is off by

so to extend this out to

your will then be off by

You can check your against your computer clock, since that is synced to the atomic clock.

the math (requires firefox))

secondsOffInXYears = offBySeconds daysElapsedForOffBy × 24 × 60 × 60 × yearsToExtendTo × 365.24224 × 24 × 60 × 60