Bitcoin calendar.

Halvings and network upgrades, the US releases that move markets, conferences, and the anniversaries of Bitcoin's history. Dates are in UTC.

Next up

In 11 days

Difficulty adjustment

NetworkThursday 12 November (estimate)

At block 975,744, mining is expected to get about 0.7% easier, so blocks keep arriving about every 10 minutes.

August 2023

This month

August 2023, dates in UTC
Monday	Tuesday	Wednesday	Thursday	Friday	Saturday	Sunday
	1UASF, 2017	2	3	4	5	6
7	8	9	10	11	12	13
14	15Overflow bug, 2010	16	17	18	19	20
21	22	23	24SegWit, 2017	25	26	27
28	29	30	31

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Events in August 2023

Tuesday 1 August1188 days ago

The user-activated soft fork (BIP 148) takes effect, 2017
6 years ago. BIP 148, the "user-activated soft fork" (UASF), took effect at block 478,484: nodes running it would reject any block that did not signal support for SegWit. Miners were already signalling after a compromise proposal, BIP 91, so no split followed from it.
NetworkSee block 478,484Source

Tuesday 15 August1174 days ago

The value overflow incident, 2010
13 years ago. A transaction in block 74,638 created about 184 billion bitcoin by exploiting a bug in how the software added up large amounts. Satoshi Nakamoto released a fix, Bitcoin 0.3.10, the same day, and the network replaced the bad block.
NetworkSee block 74,638Source

Thursday 24 August1165 days ago

SegWit activates, 2017
6 years ago. Segregated Witness (SegWit) took effect at block 481,824. It moves signatures into a separate part of the block, which fixes transaction malleability (the ability to change a transaction's ID before it confirms) and raises block capacity.
NetworkSee block 481,824Source