Time in IST and CHAST
The time difference between Irish Standard Time (IST) and Chatham Standard Time (CHAST) is 11 hours 45 minutes. Chatham Standard Time is 11 hours 45 minutes ahead of Irish Standard Time.
This means 9am IST is 8:45pm CHAST and 5pm IST is 4:45am CHAST (next day).
Irish Standard Time
- The current local time in IST is 2:38 pm (July 18, 2026)
- IST time zone offset is UTC+01:00
Chatham Standard Time
- The current local time in CHAST is 2:23 am (July 19, 2026)
- CHAST time zone offset is UTC+12:45
How to convert Irish Standard Time to Chatham Standard Time?
Add 11 hours 45 minutes to Irish Standard Time to get Chatham Standard Time.
Time in IST
00:00
Time in CHAST
00:00
Use the slider above to convert Irish Standard Time to Chatham Standard Time and view the day and night map at different times.
Day–night colors on the map:
Day
Civil twilight
Nautical twilight
Astronomical twilight
NightTime Conversion Chart
| IST | CHAST |
|---|---|
| 12am | 11:45am |
| 1am | 12:45pm |
| 2am | 1:45pm |
| 3am | 2:45pm |
| 4am | 3:45pm |
| 5am | 4:45pm |
| 6am | 5:45pm |
| 7am | 6:45pm |
| 8am | 7:45pm |
| 9am | 8:45pm |
| 10am | 9:45pm |
| 11am | 10:45pm |
| 12pm | 11:45pm |
| 1pm | 0:45am |
| 2pm | 1:45am |
| 3pm | 2:45am |
| 4pm | 3:45am |
| 5pm | 4:45am |
| 6pm | 5:45am |
| 7pm | 6:45am |
| 8pm | 7:45am |
| 9pm | 8:45am |
| 10pm | 9:45am |
| 11pm | 10:45am |