HST to SGT Converter
Understanding HST and SGT Time Zones
Hawaii Standard Time (HST)
Hawaii Standard Time is observed in undefined and uses the offset UTC-10. Major cities in this time zone include Honolulu, Maui. This time zone serves a significant global region with important economic and cultural hubs.
Singapore Time (SGT)
Singapore Time operates at UTC+8, covering undefined. Key cities include Singapore, Kuala Lumpur. The 18-hour forward offset from HST means that when professionals in Honolulu start their workday at 9:00 AM, it is already 3:00 AM in Singapore.
HST is also commonly referred to as Hawaii Time, Honolulu time, Hawaiian time. SGT is also known as Singapore time, Malaysia time, KL time. So if you are searching for Hawaii Time to Singapore time, this is the same conversion as HST to SGT.
Complete HST to SGT Conversion Table
The table below shows every two-hour increment converted from Hawaii Standard Time to Singapore Time. Business hours (9 AM – 5 PM) are highlighted for easy scheduling reference.
| HST (Hawaii Standard Time) | SGT (Singapore Time) |
|---|---|
| 12:00 AM (00:00) | 6:00 PM (18:00) |
| 2:00 AM (02:00) | 8:00 PM (20:00) |
| 4:00 AM (04:00) | 10:00 PM (22:00) |
| 6:00 AM (06:00) | 12:00 AM (00:00) (next day) |
| 8:00 AM (08:00) | 2:00 AM (02:00) (next day) |
| 10:00 AM (10:00) | 4:00 AM (04:00) (next day) |
| 12:00 PM (12:00) | 6:00 AM (06:00) (next day) |
| 2:00 PM (14:00) | 8:00 AM (08:00) (next day) |
| 4:00 PM (16:00) | 10:00 AM (10:00) (next day) |
| 6:00 PM (18:00) | 12:00 PM (12:00) (next day) |
| 8:00 PM (20:00) | 2:00 PM (14:00) (next day) |
| 10:00 PM (22:00) | 4:00 PM (16:00) (next day) |
Times shown in 12-hour and 24-hour format. Last updated 2026-03-09.
Scheduling Between HST and SGT
Remote teams spanning Honolulu and Singapore often adopt asynchronous practices to bridge the 18-hour gap. Tools like Slack, Loom, and Notion reduce the need for real-time overlap while keeping projects moving forward.
The large 18-hour gap between HST and SGT means that finding overlapping working hours requires compromise from at least one side. Consider adopting asynchronous workflows — recorded video updates, shared documents, and time-zone-aware project management tools — to supplement the limited real-time overlap.
Travel Between Honolulu and Singapore
When arriving in Singapore from Honolulu, immediately set all devices to local time. Exposure to natural daylight at the destination helps reset your circadian rhythm. Eastbound travelers should seek morning light.
Medical experts recommend allowing approximately one day of adjustment per hour of time difference. For the 18-hour shift between HST and SGT, plan for roughly one week of gradual adjustment for optimal performance.
Daylight Saving Time Considerations
Keep in mind that DST transition dates differ between regions. The US changes clocks in March and November, Europe in March and October, and Australia in April and October. This can cause temporary shifts in conversion results.
For the HST to SGT conversion specifically: HST (UTC-10) and SGT (UTC+8) neither observes DST, so the 18-hour offset remains constant throughout the year. This makes scheduling reliable and predictable.
Related Time Zone Conversions
References & Resources
Frequently Asked Questions
HST (Hawaii Standard Time) is 18 hours behind SGT (Singapore Time). HST is UTC-10 and SGT is UTC+8.
When it is 12:00 PM (noon) in HST, it is 6:00 AM (next day) in SGT.
The best overlap for business hours is approximately 3:00 AM to 11:00 AM SGT, which corresponds to 9:00 AM to 5:00 PM in HST. Given the large gap, consider alternating between early and late meeting times.
Keep in mind that DST transition dates differ between regions. The US changes clocks in March and November, Europe in March and October, and Australia in April and October. This can cause temporary shifts in conversion results.