Seiko ASTRON Handy Manual

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Time zone
4
Time zone
Based on Coordinated Universal Time (UTC), the
standard time commonly used is adopted by countries
and regions around the world. The standard time is
determined by each country or region, and the region
where the same standard time is adopted is referred
to as the time zone, and presently, the time zone is
divided into 40 zones as of March 2015.
Further, DST (Daylight Saving Time) is individually
adopted in countries and regions.
DST (Daylight Saving Time)
Depending on the area, DST (Daylight Saving Time) is
individually set.
Daylight Saving Time, or summer time, is a system
to lengthen daylight time by advancing 1 hour when
daylight time is longer during summer. Daylight
saving time has been adopted in about 80 countries,
mainly in Europe and North America. The adoption and
duration of daylight saving time varies depending on
the country.
 Daylight Saving Time is subject to change due to circumstances
of the country or region.
Coordinated Universal Time
(UTC)
UTC is the universal standard time coordinated
through an international agreement. UTC is the
primary time standard for recording time around the
world. The time obtained by adding a leap second to
the “International Atomic Time (TAI)” is determined
based on the atomic clock around the world. It is
coordinated in order to compensate for deviations
from universal time (UT) which is astronomically
determined by the UTC.

Seiko ASTRON Specifications

Frequency

frequency of crystal oscillator	32, 768 Hz
loss/gain (monthly rate)	±15 seconds

Operating Environment

operational temperature range	−10°C to +60°C
normal temperature range	5°C to 35°C

Power

power source	Secondary battery, 1 piece
duration of operation (fully charged)	Approximately 6 months
duration of operation (power save activated)	Approximately 2 years