IST
Irish Standard Time
GMT +1
CAT
Central Africa Time
GMT +2

Time Difference

Irish Standard Time is 1 hours behind of Central Africa Time
So 11:00 pm23:00 in IST is 12:00 am00:00 in CAT

11:00 pm23:00 Irish Standard Time (IST). Offset UTC +1:00 hour
12:00 am00:00 Central Africa Time (CAT). Offset UTC +2:00 hours

11:00 pm23:00 IST / 12:00 am00:00 CAT

IST CAT
12am (midnight) 1am
1am 2am
2am 3am
3am 4am
4am 5am
5am 6am
6am 7am
7am 8am
8am 9am
9am 10am
10am 11am
11am 12pm (noon)
12pm (noon) 1pm
1pm 2pm
2pm 3pm
3pm 4pm
4pm 5pm
5pm 6pm
6pm 7pm
7pm 8pm
8pm 9pm
9pm 10pm
10pm 11pm
11pm 12am (midnight)
0:00 1:00
1:00 2:00
2:00 3:00
3:00 4:00
4:00 5:00
5:00 6:00
6:00 7:00
7:00 8:00
8:00 9:00
9:00 10:00
10:00 11:00
11:00 12:00
12:00 13:00
13:00 14:00
14:00 15:00
15:00 16:00
16:00 17:00
17:00 18:00
18:00 19:00
19:00 20:00
20:00 21:00
21:00 22:00
22:00 23:00
23:00 0:00

Irish Standard Time

Offset: IST is 1 hour ahead Greenwich Mean Time (GMT) and is used in Europe

Countries: It is used in following countries: Ireland

Principal Cities: The largest city in the IST timezone is Dublin from Ireland with population about 1.024 million people. Other major cities in the area are Cork, Dun Laoghaire, Luimneach, Gaillimh

Daylight Saving: This is a standard timezone, however during summer some places switch clocks for one hour forward when daylight saving comes into effect and observe Greenwich Mean Time (GMT).

Start: IST starts annually on the same date and time. and clocks were set one hour back on Sunday, March 31, 2019, at 3:00 (3:00 am) local time.

End: IST ends annually on the same date and time. and clocks are set one hour forward on Sunday, October 27, 2019, at 2:00 (2:00 am) local time.

IST Time Zone Geo Map
IST timezone map
IST representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • +01 - basic short
  • +0100 - basic
  • +01:00 - extended

Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • +0100 - sign character (+) followed by a four digit time providing hours (01) and minutes (00) of the offset. Indicates one hour and zero minutes time differences to the east of the zero meridian.

Military/NATO: Used by the U.S. military, Chinese military and others
  • Alpha - Military abbreviation for IST
  • A - short form of 'Alpha'

IANA/Olson: Reflects IST time zone boundaries defined by political bodies, primarily intended for use with computer programs and operating systems
  • Eire
  • Europe/Dublin

IST Abbreviation: Several time zones share IST abbreviation and it could refer to these time zones

  • India Standard Time - UTC +5:30
  • Irish Standard Time - UTC +1
  • Israel Standard Time - UTC +2

Time zones with the GMT +1 offset:

  • BST - British Summer Time
  • CET - Central European Time
  • IST - Irish Standard Time
  • WEST - Western European Summer Time
  • A - Alpha Time Zone
  • CET - Central European Time
  • MEZ - Mitteleuropäische Zeit
  • WAT - West Africa Time
  • WST - Western Sahara Summer Time
  • BMT - Biel Mean Time
  • +01 -


Central Africa Time

Offset: CAT is 2 hours ahead Greenwich Mean Time (GMT) and is used in Africa

Countries: It is used in following countries: Burundi, Botswana, Congo (Dem. Rep.), Malawi, Mozambique, Namibia, Rwanda, Sudan, Zambia, Zimbabwe

Principal Cities: The largest city in the CAT timezone is Khartoum from Sudan with population about 1.975 million people. Other major cities in the area are Harare, Lubumbashi, Lusaka, Omdurman

Daylight Saving: Central Africa Time (CAT) is not adjusted for daylight saving therefore CAT remains the same through out the year. This means, unlike some time zones where the clock is set forward by one hour every summer and backward by one hour during winter to adjust for daylight saving, Central Africa Time remains the same

CAT Time Zone Geo Map
CAT timezone map
CAT representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • +02 - basic short
  • +0200 - basic
  • +02:00 - extended

Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • +0200 - sign character (+) followed by a four digit time providing hours (02) and minutes (00) of the offset. Indicates two hour and zero minutes time differences to the east of the zero meridian.

Military/NATO: Used by the U.S. military, Chinese military and others
  • Bravo - Military abbreviation for CAT
  • B - short form of 'Bravo'

IANA/Olson: Reflects CAT time zone boundaries defined by political bodies, primarily intended for use with computer programs and operating systems
  • Africa/Blantyre
  • Africa/Bujumbura
  • Africa/Gaborone
  • Africa/Harare
  • Africa/Khartoum
  • Africa/Kigali
  • Africa/Lubumbashi
  • Africa/Lusaka
  • Africa/Maputo
  • Africa/Windhoek

Time zones with the GMT +2 offset:

  • CEST - Central European Summer Time
  • EET - Eastern European Time
  • MESZ - Mitteleuropäische Sommerzeit
  • B - Bravo Time Zone
  • CAT - Central Africa Time
  • IST - Israel Standard Time
  • SAST - South Africa Standard Time
  • WAST - West Africa Summer Time