Water 5-Common Data Types-Date and Time

Contract
Parameter key	Default value	Type
start	opt
end	opt
duration	opt

Water Contract
<class datetime_interval start =opt end =opt duration=opt />

datetime_interval has a start and end date as well as the duration that's between the two. datetime_interval maintains a consistent relationship between those three values.

<datetime_interval start=<datetime 2005 12 3/> end=<datetime 2005 12 5/>/>.duration

<duration days=2/>

<datetime_interval start=<datetime 2005 12 3/> duration=<duration days=2/>/>.end

<datetime 2005 12 5/>

<datetime_interval end=<datetime 2005 12 5/> duration=<duration days=2/>/>.start

<datetime 2005 12 3/>