“The Hows of Us” made history on Monday as it crossed the P600-million mark at the domestic box office — the first Philippine-produced film to achieve the feat.

As of 5 p.m., September 17, “The Hows of Us” raked in P601,152,867.12 in domestic ticket sales, according to producer Star Cinema.

With its 20-day haul, the Kathryn Bernardo and Daniel Padilla starrer has overtaken the P571-million domestic gross of Vice Ganda’s “Gandarrapiddo: The Revenger Squad” (2017), previously the highest grossing Filipino film of all time.

The box office tally of “The Hows of Us” so far is all the more impressive as the Cathy Garcia-Molina film is yet to enter its fourth weekend. Unlike “The Revenger Squad,” it is also not an entry to the Metro Manila Film Festival, the Christmastime annual event that traditionally sees a boom of moviegoers.

Daniel Padilla and Kathryn Bernardo portray Primo and George, whose long-term relationship encounters its biggest challenge in ‘The Hows of Us’. @carmiraymundo/Instagram

Previously, another Star Cinema film, “The Super Parental Guardians” (2017) nearly breached the P600-million mark in earnings, with P598 million — and that was a worldwide tally. Domestically, it concluded its theatrical run with P550 million.

The P601-million figure of “The Hows of Us” does not include yet its earnings from international screenings, which started September 7. The romance drama was also shown in UAE, Papua New Guinea, Brunei, Malaysia, Saipan, Canada, Australia, Vietnam, and Hong Kong.