1) Download latest ZIUpdater from mentioned link (Attaching the currently latest version(1.1.2.1))
2) Unpack the 'ziupdater-1.1.2.1.jar' (current version) file from the downloaded tool.
4) Move the files 'ziupdater-1.1.2.1.jar' (Step 2) and 'tzdata-latest.tar.gz' (Step 3) to ServiceDesk installed directory(<SDP_HOME>) folder.
5) Run the below command in cmd under <SDP_HOME> directory
For windows:

jre\bin\java -jar ziupdater-1.1.2.1.jar -V -l file:tzdata-latest.tar.gz