Millennium is time unit. Definition of 1 millennium ≡ 1000 years (Gregorian). A thousand Gregorian years = 365.2425 × 1000 × 86400 s = 31.556952 Gs. Compared to second, millennium is bigger unit.
• 1 millennium = (exactly) `31556952000` [s]
• 1 [s] = (exactly) `1/(31556952000)` millennium = 3.1688738506811 × 10-11 millennium
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Multiply convert of millennium to common time units:
millenniumTime units sort by name in ABC order
See also: Gregorian year. http://conversion.org/time/yea...