dtend

Date Time string 

End date of the crossover values to retrieve. 

A value of 0 means get all crossover dates until the last known year (2087).

N 

0

dtstart

Date Time string 

Start date of crossover values to retrieve. 

A value of 0 means get all crossover dates from the first known year (1987).

N 

0

fmt-out

string 

The format for the returned data. 

Two format types: 

text/calendar

text/xml

Y 

text/calendar

id

unique identifier string 

The session identifier. 

Y 

N/A