StartTimeZone's ZN and ZX value

Hi everyone,

we are writing an 3rd party application which creates calendar items into domino server.

I have a question regarding the ZN & ZX value in the StartTimeZone property. Are they required?

normally it looks like (PST)

Z=8$DO=1$DL=4 1 1 10 -1 1$ZX=50$ZN=Pacific

Our application have to save this string into domino. However ZX and ZN are optional (& specific to Notes). So what should our application do? (skip them and save “Z=8$DO=1$DL=4 1 1 10 -1 1”). Is there somewhere our application can find out the proper ZN/ZX values to save to the note?

Many thanks

Arnold