Helena Regional Airport is 2 hours behind James M. Cox Dayton International Airport.

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James M. Cox Dayton International Airport   7:40 PM on Sunday, Jun 29, 2025

Helena Regional Airport   5:40 PM on Sunday, Jun 29, 2025

Map from DAY to HLN

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Meeting planner for James M. Cox Dayton International Airport and Helena Regional Airport

To schedule a conference call or plan a meeting at the best time for both parties, you should try between 11:00 AM and 5:00 PM your time in DAY. That will end up being between 9:00 AM and 3:00 PM in HLN. The chart below shows overlapping times.

Schedule a phone call from DAY to HLN

If you are at DAY and you want to call a friend at HLN, you can try calling them between 9:00 AM and 1:00 AM your time. This will be between 7AM - 11PM their time, since Helena Regional Airport is 2 hours behind James M. Cox Dayton International Airport.

If you're available any time, but you want to reach someone in HLN at work, you may want to try between 11:00 AM and 7:00 PM your time. This is the best time to reach them from 9AM - 5PM during normal working hours.

Time difference

Travelmath provides an online time zone converter for places all over the world. You can enter airports, cities, states, countries, or zip codes to find the time difference between any two locations. The calculator will automatically adjust for daylight saving time (DST) in the summer. You can use it as a meeting planner or a scheduler to find the best time to make international phone calls. World time zones have a positive or negative offset computed from Coordinated Universal Time (UTC), or Greenwich Mean Time (GMT). UTC has uniform seconds defined by International Atomic Time (TAI), with leap seconds announced at irregular intervals to compensate for the Earth's slowing rotation. The tz database or zoneinfo database uses the closest city, rather than the more common Eastern, Central, Mountain or Pacific time zones in the United States. Countries often change their daylight saving rules, so please help us stay current by letting us know if you find any pages that need updates.