When selecting the home time, the owner sets the time zone governing his or her usual place of residence, selecting it from among 37 different world time zones on the city ring, including those that respect 30-minute (e.g. Delhi, Caracas) and 45-minute offsets (e.g. Eucla), and then adjusts for Standard Time (STD) or Daylight Saving Time (DST).
The time zones on the city ring are indicated using three-letter IATA codes (international airport codes, e.g. FRA for Frankfurt am Main, LAX for Los Angeles International, DXB for Dubai, etc.) and are displayed in two small windows at 8 o’clock on the dial, one dedicated to Standard Time (STD), the other to Daylight Saving Time (DST).