See the official Argo Workflows documentation for CronWorkflow - https://argo-workflows.readthedocs.io/en/latest/cron-workflows/#cronworkflow-options

The example given for the CronWorkflow Options timezone field:

IANA Timezone to run Workflows. Example: America/Los_Angeles

Use America/Los_Angeles instead of US/Pacific.

apiVersion: argoproj.io/v1alpha1
kind: CronWorkflow
metadata:
  name: testing-wf
spec:
  schedule: "59 22 * * *"
  timezone: "America/Los_Angeles"

References:

• https://en.wikipedia.org/wiki/List_of_tz_database_time_zones