World Timezones

CST to AST-ATLANTIC Converter

Compare AST-ATLANTIC to CST instead
Central Time11:35 pmThu, Jun 4
Central TimeCDT
North America · UTC-5
11:35 pmThu, Jun 4
12a
1a
2a
3a
4a
5a
6a
7a
8a
9a
10a
11a
12p
1p
2p
3p
4p
5p
6p
7p
8p
9p
10p
11p
Atlantic TimeADT
North America · UTC-3
1:35 amFri, Jun 5
2a
3a
4a
5a
6a
7a
8a
9a
10a
11a
12p
1p
2p
3p
4p
5p
6p
7p
8p
9p
10p
11p
12a
1a

Offset

The time difference between Central Time and Atlantic Time is 2 hours.

2 hours

Central Time (CDT) is behind Atlantic Time (ADT).

CDT: UTC-5

ADT: UTC-3

Both zones are currently observing daylight saving time.

When to schedule

Business-hours overlap: 9 AM–3 PM in Central Time (11 AM–5 PM in Atlantic Time).

Both teams are in working hours during this window on weekdays.

Suggested time: 12:00 PM Central Time (2:00 PM Atlantic Time).

This window may shift by an hour during daylight saving time.

Public holidays in 2026

National public holidays can affect availability — a counterpart is likely off work on their own holidays, so it's worth planning meetings and deadlines around them.

United States

  • New Year's DayThu, Jan 1
  • Martin Luther King, Jr. DayMon, Jan 19
  • Presidents DayMon, Feb 16
  • Memorial DayMon, May 25
  • Juneteenth National Independence DayFri, Jun 19
  • Independence DayFri, Jul 3
  • Labour DayMon, Sep 7
  • Columbus DayMon, Oct 12
  • Veterans DayWed, Nov 11
  • Thanksgiving DayThu, Nov 26
  • Christmas DayFri, Dec 25

Canada

  • New Year's DayThu, Jan 1
  • Good FridayFri, Apr 3
  • Victoria DayMon, May 18
  • Canada DayWed, Jul 1
  • Labour DayMon, Sep 7
  • National Day for Truth and ReconciliationWed, Sep 30
  • ThanksgivingMon, Oct 12
  • Christmas DayFri, Dec 25

About these zones

Central Time is also known as CST, or CDT. To call United States, dial +1.

Atlantic Time is also known as AST, or ADT. To call Canada, dial +1.

Atlantic Time is approximately 1,200 miles east of Central Time.

Quick reference

Full 24-hour conversion table — tap any time to open it in the converter.

CSTAST-ATLANTICDay
12:00 am2:00 amSame day
1:00 am3:00 amSame day
2:00 am4:00 amSame day
3:00 am5:00 amSame day
4:00 am6:00 amSame day
5:00 am7:00 amSame day
6:00 am8:00 amSame day
7:00 am9:00 amSame day
8:00 am10:00 amSame day
9:00 am11:00 amSame day
10:00 am12:00 pmSame day
11:00 am1:00 pmSame day
12:00 pm2:00 pmSame day
1:00 pm3:00 pmSame day
2:00 pm4:00 pmSame day
3:00 pm5:00 pmSame day
4:00 pm6:00 pmSame day
5:00 pm7:00 pmSame day
6:00 pm8:00 pmSame day
7:00 pm9:00 pmSame day
8:00 pm10:00 pmSame day
9:00 pm11:00 pmSame day
10:00 pm12:00 am+1 day
11:00 pm1:00 am+1 day

Daylight saving time

Both Central Time and Atlantic Time observe daylight saving time and transition on the same date.

Next transition: Sunday, November 1, 2026 (fall back).

Because they transition simultaneously, the offset between these zones remains constant year-round.

See the daylight saving time page for transition dates across every time zone.

Daylight today

Central Time
Sunrise
5:18 AM
Sunset
8:22 PM
Day length
15h 4m
Atlantic Time
Sunrise
5:31 AM
Sunset
8:56 PM
Day length
15h 25m

Cities in these zones

Cities in Atlantic Time

Browse all cities to see the current local time anywhere.

Airports in these zones

Airports in Central Time

  • GYY
  • MDW
  • ORD
  • HOU
  • IAH
  • SAT
  • DAL
  • DFW
  • AUS
  • BNA

Airports in Atlantic Time

  • YHZ

Related conversions

Common conversions

What is 9:00 am CST in AST-ATLANTIC?
9:00 am CST is 11:00 am AST-ATLANTIC.
What is 12:00 pm CST in AST-ATLANTIC?
12:00 pm CST is 2:00 pm AST-ATLANTIC.
What is 12:30 pm CST in AST-ATLANTIC?
12:30 pm CST is 2:30 pm AST-ATLANTIC.
What is 2:00 pm CST in AST-ATLANTIC?
2:00 pm CST is 4:00 pm AST-ATLANTIC.
What is 5:00 pm CST in AST-ATLANTIC?
5:00 pm CST is 7:00 pm AST-ATLANTIC.
What is 11:30 pm CST in AST-ATLANTIC?
11:30 pm CST is 1:30 am AST-ATLANTIC, the next day.