Period

Period represents two dates with a start and finish.

Schema ID

https://gobl.org/draft-0/cal/period

Title	Property	Type	Description
Label	`label`	string	Label is a short description of the period.
Start	`start`	cal.Date	Start indicates when this period starts.
End	`end`	cal.Date	End indicates when the period ends, and must be after the start date.

Field	Test	Validation Code / Message
Period	End not before start	`GOBL-CAL-PERIOD-10` End date must be on or after start date
`start`	Not zero	`GOBL-CAL-PERIOD-01` Start date cannot be zero
`end`	Not zero	`GOBL-CAL-PERIOD-02` End date cannot be zero

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