time

Example 

20010101T00:00:00Z

This consists of

time choice

Any text<earlier>
timeInterval
</earlier>
<later>
timeInterval
</later>
<now/>
<future/>
<year>integer</year>
group optional
<month>integer</month>
group optional
<day>integer</day>
group optional
<hour>integer</hour>
group optional
<minute>integer</minute>
<second>integer</second> optional

Places this can be found

periodicFakeEventSource contains this directly

In a group in timeRange