Format for importing CSV into project with Date/Time field?

I am doing a CSV import into a project that has a Date custom field. No matter what format I try within the CSV, Asana won’t let me choose the desired Date field during the import step.

My custom field should be a Date format with both date and time, and I’ve tried the following based on various documentation I’ve found:

  • 1/16/2025 2:36 PM
  • 2025-01-16T19:36:00:000Z

Does Asana now even support an import of a date with a time? Looking at the API output, it uses format of:

2025-01-16T19:36:00:000Z

All the import dropdown selection says is “Values must be in date format”… but they are. Not very helpful.

Update: just tried it with Date only (no time), and it works. Lame. Is time not supported in the import, even though it’s clearly supported by both the UI and the API?