San Juan to Tehran Time

San Juan (Puerto Rico) is a US territory with pharmaceutical and tech manufacturing, with key industries in pharmaceuticals, medical devices, electronics, and tourism. 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 7.5-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 San Juan and Tehran

The 7.5-hour difference between San Juan and Tehran requires careful scheduling. The best overlap window is typically 2–4 hours when both cities are within working hours. Puerto Rican business hours are typically 8 AM–5 PM, with a bilingual (English/Spanish) workforce. 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 San Juan stays on AST 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 7.5-hour time difference, San Juan 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 San Juan and Tehran.

Remote Work Between San Juan & Tehran

San Juan, a key city in Puerto Rico, and Tehran, a key city in Iran, represent a common corridor for distributed teams navigating a 7.5-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 San Juan and Tehran.

AST (AST) stands for the timezone used in San Juan, Puerto Rico (UTC-4). IRST (IRST/IRDT) is the timezone used in Tehran, Iran (UTC+3:30). San Juan is 7 hours and 30 minutes behind Tehran.

To convert AST to IRST, add 7.5 hours to AST time. For example, AST 9:00 AM = IRST 4:30 PM.