Koshi, Nepal
Koshi follows Nepal Time, which is UTC+5:45 throughout the year. Biratnagar, Dharan, Itahari, and the province’s mountain communities share one official time, although their sunrise and sunset times are not identical.
Biratnagar, Nepal
Friday, 4 September 2026
UTC+5:45 · Asia/Kathmandu
Time and sun data for Biratnagar — the largest city of Koshi
The sun in Biratnagar
Sunrise 05:38 Solar noon 11:56 Sunset 18:15 Daylight 12 h 37 min Night 11 h 23 min Civil twilight 05:15 – 18:38
Nepal · 17 542 cities · page 1 of 88
Largest cities
- Biratnagar 244 750
- Dharan 173 096
- Triyuga 71 405
- Inaruwa 70 093
- Itahari 47 984
- Khā̃dbāri̇̄ 22 903
- Dhankuta 22 084
- Bhadrapur 19 523
- Ilam 17 491
- Lobuche 8 767
- Bhojpur 3 250
- Namche Bazaar 2 324
All cities — page 1
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Current time in Koshi, Nepal
One clock setting covers the whole province: Nepal Time. There is no separate eastern Nepal zone, even though Koshi reaches Nepal’s eastern border and includes landscapes ranging from low plains to the high Himalaya.
Nepal does not make a seasonal daylight-saving adjustment. This makes local clock time predictable, but the difference between Koshi and an overseas city can still shift if that other place changes its clocks. Calendar invitations with a named time zone are safer than invitations containing only an unexplained hour.
Koshi keeps one clock from the plains to the peaks; the landscape supplies enough complications without moving the hands.
Major cities on the province clock
Biratnagar, the provincial capital, is a convenient reference for current time in Koshi. Dharan and Itahari are prominent urban centres nearby, while Damak and Birtamod are important cities farther east. All use precisely the same civil time.
Biratnagar for the provincial capital and southeastern plains Itahari for a major transport junction Dharan for the foothill urban area Damak for the eastern Terai Birtamod for southeastern Jhapa The shared time zone means travellers do not reset their watches between these cities. That convenience does not make travel times short: road conditions, elevation changes, and mountain routes are separate planning questions.
How sunrise differs within Koshi
Solar times should be looked up for a specific location. Koshi spans enough longitude and elevation for dawn and sunset to differ across the province. Seasonal changes alter day length, while mountains can block the geometric horizon and delay visible sunlight in valleys.
Biratnagar’s open lowland horizon is not a reliable visual model for settlements near steep slopes. Similarly, a sunrise listing for an eastern city should not be treated as exact for a trekking route in the north. The official clock stays constant; the sun’s apparent schedule changes with place.
For an early departure, identify whether you need astronomical sunrise, civil twilight, or direct sun on the ground. Civil twilight begins before sunrise and may provide useful light, subject to clouds and terrain. Direct illumination can arrive later behind a ridge.
Choose the nearest city or enter exact coordinates. Use Nepal Time rather than a rounded UTC offset. Check the date because daylight duration changes seasonally. Allow for terrain when visible light is important.
Questions and answers
- Is Koshi in the same time zone as Kathmandu?
- Yes. Koshi and Kathmandu both observe Nepal Time, UTC+5:45.
- Do clocks change during the year?
- No. Koshi does not observe daylight saving time.
- Which city should I use for a Koshi time check?
- Any city gives the same official time. Use the nearest city when checking sunrise, sunset, weather, or twilight.