TIMELINE-Trump's trade war: Tariff deadlines and key upcoming events

August 12 (Reuters) - The twists and turns in U.S. President Donald Trump's tariff policies have not only roiled global financial markets but also taken investors on a roller-coaster ride.

Adding to the uncertainty are tariff-related legal challenges and Trump's assertion that he will hammer out bilateral deals with trade partners.

Last week, Trump said the U.S. would impose a tariff of about 100% on semiconductor imports, exempting companies that manufacture in the U.S. or have committed to do so.

His order on "reciprocal" tariffs for exports from 69 trading partners listing higher import duty rates of 10% to 41% kicked in on August 7, raising the average U.S. import duty to its highest in a century.

On Tuesday, the U.S. and China extended the tariff truce for another 90 days, forestalling triple-digit duties on each other's goods.

With a blitz of tariff announcements on trading partners, including changes to previously threatened levies on imports from Canada, India, Taiwan and Switzerland, Trump is pressing on in his bid to reshape global trade.

Here is a timeline for key upcoming events and dates that could have a bearing on U.S. tariff policy:

August 29:

Under an executive order suspending the "de minimis" exemption, packages valued at or under $800 sent to the U.S. outside of the international postal network will face "all applicable duties" from this date.

September 29:

Drugmakers have until September 29 to respond with binding commitments on lowering prices of their medicines in the U.S., to align pharma prices with other countries.

November 10:

The extension of a tariff truce between the U.S. and China until early November buys crucial time for the seasonal autumn surge of imports in preparation for the end-of-year holiday season.