US Time Zone Converter: PST/EST/UTC with DST
zone ↔ zoneConvert times between US time zones: PST to EST, PDT to EDT, CST to EST, MST to EST, UTC to PST, UTC to EST. Automatic daylight saving time (DST) handling for all American time zones.
US Exclusive Use Cases
This converter is built specifically for American users needing precise zone-to-zone conversions with DST awareness:
- PST to EST conversion: Convert Pacific Standard Time to Eastern Standard Time for cross-coast meetings
- PDT to EDT time conversion: Convert Pacific Daylight Time to Eastern Daylight Time during summer months
- CST to EST time difference: Find the exact hour difference between Central and Eastern time zones
- MST to EST converter: Convert Mountain Standard Time to Eastern Standard Time for Rocky Mountain to East Coast coordination
- UTC to PST/EST conversion: Convert UTC to US time zones for international meetings and server logs
- US time zone converter for meetings: Schedule meetings across multiple US time zones with DST-aware results
US Time Zone Differences & DST Rules
Understanding the four mainland US time zones and their DST behavior is critical for accurate conversion:
- Four mainland zones: Eastern (ET), Central (CT), Mountain (MT), Pacific (PT) — the core US business grid
- US DST rule: "spring forward" on the second Sunday of March, "fall back" on the first Sunday of November — different from EU dates
- EDT vs EST: Eastern Daylight Time (UTC-4) vs Eastern Standard Time (UTC-5) — switches in March/November
- PDT vs PST: Pacific Daylight Time (UTC-7) vs Pacific Standard Time (UTC-8) — same DST dates as Eastern
- Arizona exception: most of Arizona stays on MST year-round, not observing DST
- Hawaii no-DST: Hawaii stays on HST (UTC-10) all year with no DST
Common Time Zone Conversion Mistakes
Common mistakes: converting PST to EST without checking DST status (gives wrong hour difference), assuming 3-hour difference is always correct (it changes for Arizona/Hawaii), manually calculating and forgetting DST dates, confusing UTC with local time for international meetings, and not accounting for the "fall back" hour overlap in November. Always use a DST-aware converter for US time zone conversions.
Tool Algorithm & Precision Explanation
The converter uses IANA time-zone identifiers for automatic DST handling:
- IANA zones: America/New_York, America/Chicago, America/Denver, America/Los_Angeles, America/Anchorage, America/Honolulu
- Automatic DST: the browser computes the correct offset for the selected date, including transition days
- Zone-pair precision: handles PST to EST, PDT to EDT, CST to EST, MST to EST, and all other US zone combinations
- UTC conversion: supports converting UTC to any US time zone and vice versa
- DST-aware difference: shows the exact hour difference for the selected date, accounting for current DST status
US Time Zone Reference Table
US time-zone offsets and DST status for all zones:
| US Zone | Standard Offset | Daylight Offset | DST? |
|---|---|---|---|
| Eastern (EST/EDT) | UTC-5 | UTC-4 | Yes |
| Central (CST/CDT) | UTC-6 | UTC-5 | Yes |
| Mountain (MST/MDT) | UTC-7 | UTC-6 | Yes (except AZ) |
| Pacific (PST/PDT) | UTC-8 | UTC-7 | Yes |
| Alaska (AKST/AKDT) | UTC-9 | UTC-8 | Yes |
| Hawaii (HST) | UTC-10 | UTC-10 | No |
DST Switch Dates for US Time Zones
US daylight saving time switch dates (same for all DST-observing zones):
| Season | Switch Date | Action | Time Change |
|---|---|---|---|
| Spring | 2nd Sunday in March | Spring Forward | 1 AM → 2 AM |
| Fall | 1st Sunday in November | Fall Back | 2 AM → 1 AM |
| 2026 Dates | March 8 / November 1 | — | — |
| 2027 Dates | March 7 / November 7 | — | — |
Frequently Asked Questions
How do I convert PST to EST?
Select Pacific (PST/PDT) as the source zone, enter your time, and choose Eastern (EST/EDT) as the target. The converter automatically handles DST so you get the correct EST time.
What is the difference between PDT and EDT?
PDT (Pacific Daylight Time) is UTC-7 while EDT (Eastern Daylight Time) is UTC-4 — a 3-hour difference during DST. Outside DST, PST is UTC-8 and EST is UTC-5, also 3 hours apart.
How do I convert UTC to PST?
UTC to PST conversion depends on DST: during standard time PST is UTC-8, during daylight time PDT is UTC-7. This converter automatically applies the correct offset based on the date.
Does the time difference between PST and EST change in summer?
No, PST/PDT stays 3 hours behind EST/EDT year-round because both zones observe DST on the same dates. However, Hawaii and Arizona differ since they do not observe DST.
When does US daylight saving time start and end?
US DST starts on the second Sunday of March (spring forward) and ends on the first Sunday of November (fall back). This differs from the EU schedule.
How do I schedule meetings across multiple US time zones?
Use this converter to find overlapping working hours. For example, a 10 AM ET meeting is 7 AM PT — check if that works for West Coast participants.
What is the difference between EDT and EST?
EDT (Eastern Daylight Time) is UTC-4 during summer, while EST (Eastern Standard Time) is UTC-5 during winter. The switch happens on the second Sunday of March (EDT) and first Sunday of November (EST).
Does Arizona observe daylight saving time?
Most of Arizona stays on Mountain Standard Time (MST) year-round and does not observe DST, except the Navajo Nation. This means Arizona is always UTC-7.