How can I make my Postgres schema automatically insert `UTC` time when using `defaultNow()`?

The example below is inserting the time using the timezone of my computer instead of UTC.

createdAt: timestamp('created_at').defaultNow(),

createdAt: timestamp('created_at').defaultNow(),

createdAt: timestamp('created_at').defaultNow(),

createdAt: timestamp('created_at').defaultNow(),