The phrase "almost two weeks since" is correct and usable in written English.
It can be used to indicate a time period that is nearly two weeks from a specific event or date.
Example: "It has been almost two weeks since we last met, and I miss our conversations."
Alternatives: "nearly two weeks since" or "close to two weeks since".
It had been almost two weeks since I'd seen the guy I was dating.
Even though it had been almost two weeks since Frank was shot, she still couldn't accept that he was dead.
Markets had been pricing in a cut for almost two weeks, since Wim Duisenberg, the ECB's president, had dropped a heavyish hint.
It's now almost two weeks since the country's federal government partially shut down because Congress couldn't pass a budget for the new fiscal year.
Laura Gross, who lives on 84th Road in Bellerose, Queens, said she had not seen a truck in almost two weeks, since the Wednesday before the blizzard.
It has been almost two weeks since a concrete dam holding back millions of gallons of toxic sludge burst, sweeping two villages along with it and killing nine people.
But in the almost six weeks since the rebate legislation was signed into law, the economic situation has changed.
It is almost eight weeks since student protesters managed to smash most of the ground floor windows, and each time I pass, the windows are still boarded up.
On Tuesday, almost three weeks since the committee's meeting, the pound recorded its worst four-day performance since the Brexit vote.
It has been almost four weeks since the polls closed and the government announced that President Mahmoud Ahmadinejad had won re-election in a landslide.
It has been almost six weeks since the Greens won three lower house seats in the NSW parliament, its biggest haul: two inner-city Sydney seats, Newtown and Balmain, and Ballina, on the north coast.
