Time in CHAST and IRST
The time difference between Chatham Standard Time (CHAST) and Iran Standard Time (IRST) is 9 hours 15 minutes. Iran Standard Time is 9 hours 15 minutes behind Chatham Standard Time.
This means 9am CHAST is 11:45pm IRST (previous day) and 5pm CHAST is 7:45am IRST.
Chatham Standard Time
- The current local time in CHAST is 11:39 am (June 4, 2026)
- CHAST time zone offset is UTC+12:45
Iran Standard Time
- The current local time in IRST is 2:24 am (June 4, 2026)
- IRST time zone offset is UTC+03:30
How to convert Chatham Standard Time to Iran Standard Time?
Subtract 9 hours 15 minutes from Chatham Standard Time to get Iran Standard Time.
Time in CHAST
00:00
Time in IRST
00:00
Use the slider above to convert Chatham Standard Time to Iran 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
| CHAST | IRST |
|---|---|
| 12am | 2:45pm |
| 1am | 3:45pm |
| 2am | 4:45pm |
| 3am | 5:45pm |
| 4am | 6:45pm |
| 5am | 7:45pm |
| 6am | 8:45pm |
| 7am | 9:45pm |
| 8am | 10:45pm |
| 9am | 11:45pm |
| 10am | 0:45am |
| 11am | 1:45am |
| 12pm | 2:45am |
| 1pm | 3:45am |
| 2pm | 4:45am |
| 3pm | 5:45am |
| 4pm | 6:45am |
| 5pm | 7:45am |
| 6pm | 8:45am |
| 7pm | 9:45am |
| 8pm | 10:45am |
| 9pm | 11:45am |
| 10pm | 12:45pm |
| 11pm | 1:45pm |