Convert Pacific Standard Time to Atlantic Standard Time (PST to AST)

Understanding PST and AST Time Zones

Pacific Standard Time (PST)

Pacific Standard Time is observed in undefined and uses the offset UTC-8. Major cities in this time zone include Los Angeles, San Francisco, Seattle, Portland. This time zone serves a significant global region with important economic and cultural hubs.

Atlantic Standard Time (AST)

Atlantic Standard Time operates at UTC-4, covering undefined. Key cities include Halifax, San Juan. The 4-hour forward offset from PST means that when professionals in Los Angeles start their workday at 9:00 AM, it is already 1:00 PM in Halifax.

PST is also commonly referred to as Pacific Time, PT, West Coast time, LA time, California time. AST is also known as Atlantic Time, Puerto Rico time. So if you are searching for Pacific Time to Atlantic Time, this is the same conversion as PST to AST.

Complete PST to AST Conversion Table

The table below shows every two-hour increment converted from Pacific Standard Time to Atlantic Standard Time. Business hours (9 AM – 5 PM) are highlighted for easy scheduling reference.

Times shown in 12-hour and 24-hour format. Last updated 2026-03-09.

Scheduling Between PST and AST

Remote teams spanning Los Angeles and Halifax often adopt asynchronous practices to bridge the 4-hour gap. Tools like Slack, Loom, and Notion reduce the need for real-time overlap while keeping projects moving forward.

The moderate 4-hour gap between PST and AST means that there is a partial overlap of business hours. Teams can typically find a 3–4 hour window that works for both sides without requiring anyone to work outside normal hours.

Travel Between Los Angeles and Halifax

When arriving in Halifax from Los Angeles, 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 4-hour shift between PST and AST, plan for about 4 days to fully acclimate.

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 PST to AST conversion specifically: PST (UTC-8) observes DST, while AST (UTC-4) does not observe DST. This means the offset between them changes by one hour seasonally — the usual 4-hour gap becomes 3 or 5 hours during DST transitions.

Related Time Zone Conversions

References & Resources

• TimeAndDate.com — World Time Zones
• NIST — Official US Time Standard
• IANA Time Zone Database
• Wikipedia — Time Zone Abbreviations
• WorldTimeServer — Current Times Worldwide

Frequently Asked Questions