Time in Koshigaya, Japan

Time zone: JST (UTC/GMT +09:00) — Asia/Tokyo

Koshigaya runs on JST. That places it 9 hours ahead of UTC (UTC+09:00); in a calendar, server config or booking form, select Asia/Tokyo.

Daylight saving is not observed here, so UTC+09:00 is year-round. Any seasonal drift you notice against another city comes from that city, not from Koshigaya.

Koshigaya has roughly 345,353 residents and ranks 46th by population among the Japan cities on this site.

How Koshigaya lines up against other major centres at this moment — the numbers move when either side changes its clocks.

Assuming a 09:00–17:00 day at both ends, these windows (in Koshigaya local time) fall inside working hours for both cities.

No shared working window exists with New York, Los Angeles, London or Sao Paulo, so those calls have to sit outside somebody's normal hours.

These Japan cities also use Asia/Tokyo, so their clocks read identically to Koshigaya at every moment of the year.

Chiba Niigata Hamamatsu Sakai Kumamoto Okayama Shizuoka Honchō