If this is done, it could be an opportunity to also capture the value of 
using https://en.wikipedia.org/wiki/Julian_day.

Astronomers make extensive use of this and have even gone to the trouble of 
setting standards like incorporating a '0' date to help with arithmetic 
calculations that extend beyond https://en.wikipedia.org/wiki/Common_Era


On Saturday, February 15, 2020 at 4:45:35 AM UTC-5, PMario wrote:
>
> Hi
>
> There seems to be an extended date in the spec: 
> https://tc39.es/ecma262/#sec-expanded-years
>
> Examples of date-time values with expanded years: 
>
> -271821-04-20T00:00:00Z 271822 B.C. 
> -000001-01-01T00:00:00Z 2 B.C. 
> +000000-01-01T00:00:00Z 1 B.C. 
> +000001-01-01T00:00:00Z 1 A.D. 
> +001970-01-01T00:00:00Z 1970 A.D. 
> +002009-12-15T00:00:00Z 2009 A.D. 
> +275760-09-13T00:00:00Z 275760 A.D.
>
> BUT TW doesn't know about it. So we would need a new field prefixed: 
> ext-date-
> or something similar.
>
> -mario
>

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