I googled a search for the DNC hacking timeline and this is one source I opened. I wish to nail down what the left claims about what days the DNC computers were hacked, and this is what this article reported:
Mueller's timeline: How the Russian hacks unfolded - POLITICO
— Breaching Podesta: The timeline begins on March 19, 2016, when the (alleged) Russian hackers sent John Podesta, Hillary Clinton’s campaign chairman, a “spearphishing” email — a fake message designed to trick him into thinking that Google was urging him to reset his password. As has been previously reported, Podesta clicked the link and entered his current password, giving (supposedly) Moscow the keys to his account. Two days later, according to the indictment, the Russians (allegedly) swept up his inbox of more than 50,000 emails. ...
March 2016 was also when the Russians (allegedly) began their intrusions into the DNC and the DCCC. ...
They got their first hit at the DCCC on April 12, accessing the committee’s network using credentials stolen from a female employee six days earlier. ...
Between April and June 2016, the (assumed) hackers installed malware called X-Agent on “at least ten DCCC computers,” according to the indictment. ...
The indictment reveals that the Russians (allegedly) got into the DNC through their access to the DCCC. On April 18, they used their malware to steal the credentials of a DCCC employee who had access to the DNC network. ...
Between late May and early June 2016, according to the indictment, the (assumed) hackers breached the DNC’s Microsoft-hosted email service and stole “thousands of emails” from committee workers. ...
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CrowdStrike's timeline taken from their source listed earlier in this thread:
CrowdStrike was contacted on April 30, 2016 to respond to a suspected breach. We began our work with the DNC on May 1, 2016, collecting intelligence and analyzing the breach. After conducting this analysis and identifying the adversaries on the network, on June 10, 2016 we initiated a coordinated remediation event to ensure the intruders were removed and could not regain access. That remediation process lasted approximately 2-3 days and was completed on June 13, 2016. ...
(CrowdStrike claimed the initiated the remediation on June 10 and by June 13, 2016 the DNC computers were impervious to attacks. Too bad the DNC wasn't warned a year earlier when the FBI testified it knew the "Russians" were hacking into the DNC, so CrowdStrike could have been called in much earler to render the DNC computers impervious to hacking.)
There is no indication of subsequent breaches taking place on any DNC machine protected by CrowdStrike Falcon®. ...
I pointed out that these Russians or hackers as well as the accusation of hacking rather than in house downloading has never been irrefutably proven. That is why Mueller charged the individuals with the alleged crime instead of declaring them guilty without a trial. But, putting the obvious aside, I want to point out that this article claims the hacking and theft of DNC emails began around March 19, 2016 and ended sometime in early June. While that may agree with CrowdStrike's statement about the timeline it does not include several more breaches not mentioned. I believe the reason the other breaches are not mentioned is because the future breaches in which DNC emails were removed serve in ways to refute the propagated narrative about the alleged Russian hacking.