Convert HST to HDT Time
Free online converter with current times, time difference, and conversion table between HST and HDT time zones.
Current time in HST: Loading...
Current time in HDT: Loading...
Time difference: +1 hours
HST to HDT Conversion Table
This table shows common HST times converted to HDT time:
About HST and HDT Time Zones
HST Time Zone
Full Name: Hawaii Standard Time
UTC Offset: UTC-10
Current Time: Loading...
Standard time in Hawaii.
Used in: USA (Hawaii), French Polynesia
HDT Time Zone
Full Name: Hawaii Daylight Time
UTC Offset: UTC-9
Current Time: Loading...
Historically used daylight saving time in Hawaii.
Used in: USA (Hawaii - historical)
How to Convert HST to HDT
Enter HST Time
Enter the HST time you want to convert using the time picker or by typing directly in 24-hour format.
Click Convert
Click the "Convert Time" button to perform the conversion from HST to HDT.
View Result
The equivalent HDT time will be displayed, along with the time difference between the two zones.
Use Conversion Table
For quick reference, you can also use the conversion table below that shows common HST times converted to HDT.
Common Uses for HST to HDT Conversion
International Business
Schedule meetings and calls between locations in USA (Hawaii) and USA (Hawaii - historical) time zones.
Travel Planning
Calculate arrival times and plan activities when traveling between USA (Hawaii) and USA (Hawaii - historical).
Event Scheduling
Convert event times for international broadcasts, webinars, or sports events between these regions.
Keeping in Touch
Find the best times to call friends, family, or colleagues across these time zones.
Frequently Asked Questions
The time difference between HST and HDT is +1 hours. This means that when it's noon (12:00 PM) in HST, it's 1:00 PM in HDT.
To convert HST to HDT time, add 1 hours to the HST time. You can use our converter at the top of this page for instant and accurate conversions.
HST does not observe DST. HDT does not observe DST.
Business hours largely overlap.
Our converter uses standard time zone offsets. For the most accurate conversions during DST transition periods, please verify the exact dates when DST begins or ends in the relevant regions, as these can vary by year and location.