CST IST Converter Calculator

Converted date and time
2025-01-15 23:30 (Wednesday, UTC+05:30)
Time Zone Converter
Converted date
2025-01-15
Converted time
23:30
Converted date falls on
Wednesday
From zone
America/Chicago
To zone
Asia/Kolkata
From zone UTC offset
UTC-06:00
To zone UTC offset
UTC+05:30
From zone offset (hours)
-6.00 h
To zone offset (hours)
5.50 h
Time difference
11.50 h
Calendar-day shift
0 days
The same instant in UTC
2025-01-15 18:00 UTC
Source time after DST resolution
12:00
Daylight-saving status of the source time
exact
Summary
2025-01-15 12:00 in America/Chicago is 2025-01-15 23:30 in Asia/Kolkata.
Worked out from IANA Time Zone Database (tzdb) and 3 other sources.
Daylight-saving rules change. Confirm the offset against a current tz database release before relying on a conversion far in the future, and confirm any medication schedule with the prescriber.

How this is worked out

4 steps
  1. Source wall time: 2025-01-15 12:00 in America/Chicago, offset UTC-06:00.
  2. Convert to the absolute instant: 2025-01-15 18:00 UTC.
  3. Read that instant in Asia/Kolkata, whose offset on that date is UTC+05:30: 2025-01-15 23:30.
  4. Difference = 5.5 h - (-6 h) = 11.5 h.

Results are general information, not financial, tax, legal, medical or engineering advice.