There seems to be a confusion over Deepavali 2013 date. Do a search in Google and nearly every result show Deepavali is on 3rd November 2013 (Sunday), including our next door neighbor Singapore (http://www.mom.gov.sg/employment-practices/employment-rights-conditions/leave-and-holiday/Pages/PublicHolidays2013.aspx).
Refer Wiki as well: http://en.wikipedia.org/wiki/Diwali
However the calendar released by Bahagian Kabinet of Prime Minister’s Department lists 2 November as Deepavali (link here: http://www.kabinet.gov.my/images/stories/kelepasanam/2013_merged.pdf)
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I’ve just sent feedback to Bahagian Kabinet to ask them to check since Deepavali supposed to be on 3rd. Hope to get reply from them. As far as I know, the festival date is consulted with KL Mariamman Temple Devasthanam, so wonder how they ended up with different date than rest of the world
Deepavali being a religious festival, is calculated based on astronomy. If you check the Hindu panchangam, it falls on ammavasai (no moon day), which is on 3rd of November this year.
Hope things can be clarified immediately as this involves religious festival and public holiday, where people will make plans for celebration and travel. Especially when Deepavali falls on Sunday because Monday becomes public holiday! 🙂

use this web for confirmation. http://www.mypanchang.com/hindufestivals2013.php
in doubt email to them they have been very helpful..If it is true the management has steered away from its true origin of Deepavali, then publicized it so people are away of the truth. No one should manipulate the vedic to their own benefits. the explaination given by the cabinet indicating that the thithis of sathurthasi is from 8pm 1/11 till 2/nov not indicating the end time.
Its is official that deepavali is on 2nd November. The cabinet has announce it on warta http://www.kabinet.gov.my/images/stories/kelepasanam/2013_merged.pdf
sunday we happy 3/11/13
when is actual deepavali date for year 2013?
in india its celebrated on 2nd in tamil nadu and few other states, and on 3rd in the rest of the states. refer: http://publicholidays.in/diwali-deepavali/
the ammavasai starts on evening of 2nd nov, so some consider that day as Deepavali.