Timezone Abbreviations One identifier can mean different zones: PST: *P*acific *S*tandard *T*ime, *P*akistan *S*tandard *T*ime EST: *E*astern *S*tandard *T*ime (USA), *E*astern *S*tandard *T*ime (Australia) and *E*astern Brazil *S*tandard *T*ime One zone can have multiple identifiers Central Europe Summer Time: CEST or CETDST Names can be different on Operating Systems