Port Arthur to AST Time Converter

Updating current time…
Port Arthur
Texas, USACDT
UTC−5
12am
3am
6am
9am
12pm
3pm
6pm
9pm
Port Arthur's clocks go back 1 hour on Sun, Nov 1 · CDT → CST
ADT/AST
Atlantic Daylight Time
UTC−3
2h ahead
12am
3am
6am
9am
12pm
3pm
6pm
9pm
Atlantic Time is on daylight saving time: ADT (UTC−3) until Sun, Nov 1.
Use AST all year (UTC−4)

Quick answers

Selected conversion

7:00 am07:00 CDT (UTC-5), Oct 25, 2026 = 9:00 am09:00 ADT (UTC-3), Oct 25, 2026

Port Arthur is 2 hours behind ADT.

How the time difference changes

For most of the year, Port Arthur is 2 hours behind ADT. From Nov 1, 2026 to Mar 14, 2027, Port Arthur is 2 hours behind AST. Briefly around clock changes, Port Arthur is 1 hour behind AST or Port Arthur is 3 hours behind ADT.

For most of the year, working hours of 9:00 am to 6:00 pm in Port Arthur correspond to 11:00 am to 8:00 pm in ADT. At other times of the year, working hours of 9:00 am to 6:00 pm in Port Arthur correspond to 11:00 am to 8:00 pm in AST.For most of the year, working hours of 09:00 to 18:00 in Port Arthur correspond to 11:00 to 20:00 in ADT. At other times of the year, working hours of 09:00 to 18:00 in Port Arthur correspond to 11:00 to 20:00 in AST.

Compare Port Arthur time with AST time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.

Time Difference

CDT (Central Daylight Time) is 2 hours behind Atlantic Daylight Time.
7:00 am07:00 in Port Arthur, TX, USA is 9:00 am09:00 in ADT

Port Arthur to ADT call time
Best time for a conference call or a meeting is between 9am-4pm09:00-16:00 in Port Arthur which corresponds to 11am-6pm11:00-18:00 in ADT

7:00 am07:00 CDT (Central Daylight Time) (Port Arthur, TX, USA). Offset UTC -5:00 hours
9:00 am09:00 Atlantic Daylight Time (ADT). Offset UTC -3:00 hours

7:00 am07:00 Port Arthur, TX, USA / 9:00 am09:00 ADT

Choose an hour to update the converter. Day labels such as “next day” or “+1” are relative to the selected date in the first column. Use Up and Down arrow keys, Home or End to move between hours, then Enter or Space to select.

Hourly time comparison
Port Arthur, TX, USAADT
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Port Arthur Time Zone and Facts

Time Zone

Abbreviation / Offset
CDT – Central Daylight Time, UTC-5 (now, daylight saving time)
CST – Central Standard Time, UTC-6 (standard time)
Daylight Saving Time Ends
123456789101112Sunday, November 1, 2026 at 2:00 amSunday, November 1, 2026 at 02:00: clocks go back 1 hour to 1:00 am01:00 (CST). DST ends on the 1st Sunday of November each year. Also called Fall Back or Winter Time.
Daylight Saving Time Starts
123456789101112Sunday, March 14, 2027 at 2:00 amSunday, March 14, 2027 at 02:00: clocks go forward 1 hour to 3:00 am03:00 (CDT). DST starts on the 2nd Sunday of March each year. Also called Spring Forward or Summer Time.
Clock Changes
USA daylight saving time · Clock changes worldwide

Port Arthur Facts

Country
USA
State
Texas
Alternative Names
BPT, Port Arthur, Port Arthur i Texas, Port Artur, Port-Artur, a se gang, bwrt arthr, poteuaseo, potoasa, pwrt artr tgzas, Порт Артур, Порт-Артур, Պորտ-Արտուր, بورت أرثر, پورت آرتر، تگزاس, پورٹ آرتھر، ٹیکساس, ポートアーサー, 阿瑟港, 포트아서
Population
55,340
Currency
Dollar (USD)
Geographic Coordinates
29° 53' N Latitude / 93° 56' W Longitude
International Dialing Code
+1
More About Port Arthur
Port Arthur local time and city facts

Atlantic Standard Time

Offset: AST is 4 hours behind Greenwich Mean Time (GMT).

Countries using this time zone: Anguilla, Antigua and Barbuda, Aruba, Barbados, Bermuda, British Virgin Islands, Canada, Caribbean Netherlands, Curaçao, Dominica, Dominican Republic, Greenland, Grenada, Guadeloupe, Martinique, Montserrat, Puerto Rico, Saint Barthélemy, Saint Kitts and Nevis, Saint Lucia, Saint Martin, Saint Vincent and the Grenadines, Sint Maarten, Trinidad and Tobago, US Virgin Islands

Principal Cities: The largest city in the AST time zone is Santo Domingo in the Dominican Republic, with about 2.202 million people. Other major cities in this time zone include Santiago de los Caballeros, Halifax, San Juan, San Pedro de Macorís.

French: HNA - Heure Normale de l'Atlantique

Spanish: AST - Tiempo Estándar del Atlántico

Map of the areas on Atlantic Standard Time (AST)
AST all year AST part of the year

Today the lighter areas are on UTC−3 (ADT).

Open the world time zone map© OpenStreetMap

Daylight Saving: This is a standard time zone. During summer, some places set clocks forward one hour for daylight saving time and observe Atlantic Daylight Time (ADT).

123456789101112End: Atlantic Standard Time (AST) ended on Sunday, March 8, 2026 at 2:00 am02:00 local time and clocks were set one hour forward to Sunday, March 8, 2026, 3:00 am03:00 local daylight time instead. Standard time ends annually on the second Sunday of March.

123456789101112Start: Atlantic Standard Time (AST) starts on Sunday, November 1, 2026 at 2:00 am02:00 local time and clocks are set one hour back to Sunday, November 1, 2026, 1:00 am01:00. Standard time starts annually on the first Sunday of November.

See Canada daylight saving time and upcoming clock changes worldwide.

AST representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • -04 - basic short
  • -0400 - basic
  • -04:00 - extended
Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • -0400 - sign character (-) followed by a four digit time providing hours (04) and minutes (00) of the offset. Indicates an offset of four hours to the west of the zero meridian.
Military/NATO: Used by the U.S. military, Chinese military and others
  • Quebec - Military abbreviation for AST
  • Q - short form of 'Quebec'
IANA/Olson: Reflects AST time zone boundaries defined by political bodies, primarily intended for use with computer programs and operating systems
  • America/Anguilla
  • America/Antigua
  • America/Aruba
  • America/Barbados
  • America/Blanc-Sablon
  • America/Curacao
  • America/Dominica
  • America/Glace_Bay
  • America/Goose_Bay
  • America/Grenada
  • America/Guadeloupe
  • America/Halifax
  • America/Kralendijk
  • America/Lower_Princes
  • America/Marigot
  • America/Martinique
  • America/Moncton
  • America/Montserrat
  • America/Port_of_Spain
  • America/Puerto_Rico
  • America/Santo_Domingo
  • America/St_Barthelemy
  • America/St_Kitts
  • America/St_Lucia
  • America/St_Thomas
  • America/St_Vincent
  • America/Thule
  • America/Tortola
  • America/Virgin
  • Atlantic/Bermuda
  • Canada/Atlantic
AST Abbreviation: Several time zones share AST abbreviation and it could refer to these time zones
  • Atlantic Standard Time - UTC -4
  • Arabia Standard Time - UTC +3
Time zones with the GMT -4 offset:
  • AST - Atlantic Standard Time
  • EDT - Eastern Daylight Time
  • AMT - Amazon Time
  • BOT - Bolivia Time
  • CDT - Cuba Daylight Time
  • CLT - Chile Standard Time
  • GYT - Guyana Time
  • HLV - Hora Legal de Venezuela
  • Q - Quebec Time Zone
  • VET - Venezuelan Standard Time
EST to ISTGMT to ESTPST to ESTEST to GMTPST to GMT