You should live by the sun, regardless of what the clock says. The clock is useful for measuring time, and UTC, TAI, etc can be useful for that, but if you want

You should live by the sun, regardless of what the clock says. The clock is useful for measuring time, and UTC, TAI, etc can be useful for that, but if you want to wake up, etc, you can do by the sun light. For local time, you can use the solar time, which can be used with a sundial.