How to set time zone in code in a Firebase Cloud Function v2 scheduled function?

In Firebase Cloud Functions v1, configuring the time zone for scheduled functions could be done in the function’s signature.

exports.v1ScheduledFunction = functions.pubsub.schedule("every day 00:00")
                                              .timeZone("Etc/GMT+12")
                                              .onRun(async (context) => {
    ...
});

However, with the syntax changes in v2, this changes.

exports.v2ScheduledFunction = onSchedule("every day 00:00", async (event) => {
    ...
});

The documentation says that v2 can take Unix Crontab and App Engine syntax for the string schedule. However, I don’t think you can specify time zone in either Unix Crontab or App Engine syntax. Is there a way to specify time zone for scheduled functions in v2 in code? If not, how can it be done?

>Solution :

Per the API reference, the first parameter is either a schedule or a scheduler.ScheduleOptions object. FYI: This options object can also contain options in GlobalOptions (secrets, region, etc.).

To specify a time zone, you would use:

exports.v2ScheduledFunction = onSchedule(
  {
    schedule: "every day 00:00",
    timeZone: "Etc/GMT+12"
  },
  async (event) => {
    // your function code
  }
)