Hagåtña to Tehran Time

Hagåtña (Guam) is a US territory and strategic Pacific military base, with key industries in US military, tourism, construction, and fishing. Tehran (Iran) is one of the Middle East's largest economies with a young population, known for oil and gas, petrochemicals, automotive, and agriculture. 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 Hagåtña and Tehran

The 6.5-hour difference between Hagåtña and Tehran requires careful scheduling. The best overlap window is typically 2–4 hours when both cities are within working hours. Guam business hours are typically 8 AM–5 PM, with a US-style business environment. Iranian business hours are typically 8 AM–4 PM Saturday–Wednesday, with Thursday as a half-day and Friday off. 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), while Hagåtña stays on ChST year-round. When Tehran switches to daylight time, the effective time difference shifts by 1 hour. This typically happens in spring and fall, and the exact dates vary by country. If you have recurring cross-timezone meetings, recalculate the schedule after each DST transition.

Collaboration Tools & Workflow

With a 6.5-hour time difference, Hagåtña and Tehran 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 Hagåtña and Tehran.

Remote Work Between Hagåtña & Tehran

Hagåtña, a key city in Guam, and Tehran, a key city in Iran, 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 Hagåtña and Tehran.

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

To convert ChST to IRST, subtract 6.5 hours from ChST time. For example, ChST 9:00 AM = IRST 2:30 AM.