I tried November, no availability. I got Feb 2 and 3 - going out Thursday coming back Friday. However, these are the rules as mentioned earlier:

1 Rules and restrictions
Gulf Air
From: Delhi, India (DEL-Indira Gandhi Intl.)
To: Abu Dhabi, United Arab Emirates (AUH-All Airports)
(and return)
Fare Basis Code: ARTIN

PENALTIES

CHANGES

ANY TIME
CHANGES PERMITTED FOR REVALIDATION.
NOTE -
DATE CHANGE IS PERMITTED FREE OF CHARGE ANYTIME.

CANCELLATIONS

BEFORE DEPARTURE
PER TICKET CHARGE INR 300 FOR CANCEL/REFUND.
WAIVED FOR SCHEDULE CHANGE/ILLNESS OR DEATH OF
PASSENGER OR FAMILY MEMBER.
NOTE -
CHILD / INFANT DISCOUNTS APPLY.

AFTER DEPARTURE
CANCELLATIONS PERMITTED FOR CANCEL/REFUND.
WAIVED FOR SCHEDULE CHANGE/ILLNESS OR DEATH OF
PASSENGER OR FAMILY MEMBER.
NOTE -
DEDUCT THE APPLICABLE CIRCULAR FARE FOR THE
JOURNEY TRAVELLED.
--------
CHILD / INFANT DISCOUNTS APPLY.
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OFFICIAL DOCUMENTATION NEEDED AS PROOF TO SUPPORT
ILLNESS/DEATH.