Tehran to Hagåtña Time

Tehran (Iran) is one of the Middle East's largest economies with a young population, with key industries in oil and gas, petrochemicals, automotive, and agriculture. Hagåtña (Guam) is a US territory and strategic Pacific military base, known for US military, tourism, construction, and fishing. With a 6.5-hour time difference, professionals frequently schedule cross-border calls between these two cities for international trade, remote team collaboration, and client meetings.

Scheduling Meetings Between Tehran and Hagåtña

The 6.5-hour difference between Tehran and Hagåtña requires careful scheduling. The best overlap window is typically 2–4 hours when both cities are within working hours. Iranian business hours are typically 8 AM–4 PM Saturday–Wednesday, with Thursday as a half-day and Friday off. Guam business hours are typically 8 AM–5 PM, with a US-style business environment. Teams often designate specific "overlap hours" for real-time collaboration and use asynchronous communication (Slack, email, recorded video) for the rest of the day.

Daylight Saving Time Considerations

Tehran observes Daylight Saving Time (IRST/IRDT), but Hagåtña does not — it stays on ChST year-round. This means the time difference between Tehran and Hagåtña changes by 1 hour when Tehran switches clocks. During Iran's summer, the gap is 5.5–7.5 hours instead of the standard 6.5 hours. Mark DST transition dates on your calendar to avoid missed meetings.

Collaboration Tools & Workflow

With a 6.5-hour time difference, Tehran and Hagåtña teams operate in a near "follow-the-sun" model. When one team logs off, the other picks up — enabling near-24-hour productivity on shared projects. The key challenge is handoff quality: teams should document decisions in shared tools (Notion, Confluence, Linear), record video updates with Loom, and write thorough pull request descriptions. Weekly all-hands meetings require someone to take an early morning or late evening call, so the best practice is to rotate this burden fairly between Tehran and Hagåtña.

Remote Work Between Tehran & Hagåtña

Tehran, a key city in Iran, and Hagåtña, a key city in Guam, represent a common corridor for distributed teams navigating a 6.5-hour time difference. Remote workers and freelancers operating between these cities should plan their day around the overlap window — typically the late morning for one city and early morning or late afternoon for the other. Using a world clock widget, setting Slack status with local time, and blocking "no-meeting" deep work hours outside the overlap are essential practices for productive cross-timezone remote collaboration between Tehran and Hagåtña.

IRST (IRST/IRDT) stands for the timezone used in Tehran, Iran (UTC+3:30). ChST (ChST) is the timezone used in Hagåtña, Guam (UTC+10). Tehran is 6 hours and 30 minutes behind Hagåtña.

To convert IRST to ChST, add 6.5 hours to IRST time. For example, IRST 9:00 AM = ChST 3:30 PM.