UPDATE 1-PKO BP moves up proposed $1.7 bln rights issue

* Record date moved up by three weeks

* Shareholders to vote on change on Aug. 31

WARSAW, Aug 4 (Reuters) - PKO BP, PKOB.WA Poland's largest bank by assets, has moved up the proposed record date for a planned 5 billion zlotys ($1.7 billion) rights issue by three weeks to to Oct. 6, it said in a statement on Tuesday.

The state-controlled lender's shareholders will vote on the rights issue, Poland's largest share issue since PKO's 2004 listing, at an extraordinary meeting scheduled for Aug. 31.

"The change of the rights record date... will allow for the optimization both of the timetable for, and the costs related to the offering," the bank said.

The record date is the date on which shareholders must own shares to be eligible to buy newly issued shares. It was previously set for Oct. 29.

PKO fired its chief executive last month after he clashed with the supervisory board over the cash call and plans to extract up to 3 billion zlotys in dividends from PKO to help boost the state budget. [ID:nL7190949]

Some analysts worry that the lack of a permanent chief executive could hamper plans to raise new cash from investors, which the bank hopes to use to fund new loans.

The shareholders are also scheduled to make changes of the supervisory board, which is controlled by the state treasury.

PKO shares have lost 6 percent this year versus a 9-percent gain of Warsaw's banking index .BNKI.

($1=2.913 Zloty) (Reporting by Chris Borowski; editing by Simon Jessop)