Full name: millennium
Plural form: millennia
Category type: time
Scale factor: 31536000000
The SI base unit for time is the second.
1 second is equal to 3.1709791983765E-11 millennium.
Valid units must be of the time type.
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A millennium is a period of time equal to one thousand years. There are two main viewpoints about naming millennia and there was a popular debate leading up to the celebrations of the year 2000 as to whether 2000 was the beginning of a new millennium. Historically, there has been debate around the turn of the millennium, centuries and decades before.