10.3. Timezones

Different countries (and sometimes even different regions within a single country) operate on different timezones and DST regimes. Programs that input and output times must take into account the timezone and DST regime of the system on which they are run. Fortunately, all of the details are handled by the C library.

10.3.1.

10.3.1.1. Timezone definitions

Timezone information tends to be both voluminous and volatile. For this reason, rather than encoding it directly into programs or libraries, the system maintains this information in files in standard formats.