When Is National Seester Day?


National Seester Day is on the 8th of August with 40 tweets.

More on Seester Day below.



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About Seester Day

Is It Seester Day Today?

It's Seester day on the 8th of August.

Seester Day' is by our calculation on: August the 8th. The first time we detected Seester Day was the 2nd of August 2015 and the most recent detection of references to Seester Day was 1 year, 4 months ago.

We're now tracking the sentiment around every mention of Seester day to show how people feel about Seester. See if people like Seester here.
We're detecting how Seester affects other things more widely than just being a celebrated day. See how Seester affects company share prices.

There were many celebrations relating to national holdiays written about on social media that our algorithms picked up, on the 8th of August. In total we detected 97 total unique days being shared such as Sister Day which had 5,274 people talking about it, or Sisters Day having 3,036 tweets. A random sample of which are shown below.


National days on the 8th of August

National Seester Day, on the 8th of August

How Is The Date For Seester Day Calculated?

The day shown for 'National Seester Day' is based off how much chitter-chatter and buzz there was on Aug. 8, 2016 across social media making references to 'Seester Day'. Our algorithms examine all of the references to National Days across social media and updates whatnationaldayisit.com hourly, with our homepage displaying the current national day, including others such as: Cat, Friendship or Dollar Day. This crowdsourcing of data method to assess the National Seester Day date is used as opposed to being connected with any Government sacntioned lists :D Hurrah for democracy by concensus!


I'd Like To Promote National Seester Day

We've put together the following resources full of nifty tips on how to increase the reach of Seester Day. The resources include: graphs, badges, and resources on what steps to take to boost Seester Day's visibility.

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National Seester Day

It's Seester Day
On August 8th

Can I Register Seester Day?

We don't have an international authority or governmental remit to declare any officially celebrated "national Seester day". We only aim to programatically reflect what 'National Day' it is based of what The Internet Says It Is. We believe this is much more fun as it reflects the nature of how the most amusing / interesting national days are often created organically and grow based off popular social trends and sharing, as such we don't add new days to our database unless they are organically observed on social media.


Is it National Seester Day Everywhere?

Yes? No.. Sort of | Maybe ¯\_(ツ)_/¯

What's really intersting is how whilst some National Days like National Daughters Day are seemingly celebrated internationally irrespective of geography, some very popular days (That often become the No. 1 National Day on our homepage) are in fact locally very specific and are offical holidays celebrated on a Country's national calendar. Take National Rambutan Day for instance, Rambutan is a popular Souteast Asian fruit and not seen so much in the UK, Europe or the USA. Some regionally specific trends subsequently become immensely popular internationally and worldwide, partly fuelled by widely shared 'National Days', National Pabebe Wave Day being one such example.

teenagers sharing national days on social media

Hang On, It Was National Seester Day Already This Year..!?

Yes, this is strangely enough entirely possible. The date shown for National Seester Day can change, if for instance several hundred people tweeted about Seester Day in early April, then in May a few thousand people tweeted about Seester day, then the date shown for National Seester Day, could come up twice :D

We have also detected mentions of Seester day on;



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For people who wish to promote National Seester Day, we've put together the following resources.
See also: How does Seester affect the share price of Apple, Facebook, Microsoft?
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