How to Set Wagtail DateBlock Default to Current Date

I have a DateBlock inside a StreamField inside one of my Wagtail models:

    jobs = StreamField([
      ('job', StructBlock([
        ('job_title', CharBlock(required=True, max_length=50)),
        ('job_location', CharBlock(required=True, max_length=50, help_text="City and state")),
        ('job_description', TextBlock(required=True, min_length=100, max_length=275)),
        ('link',
         URLBlock(required=True, help_text="Provide a link to the job posting")),
        ('posted_date', DateBlock(required=False, help_text="posted date")),
      ], verbose_name="BYU job"),),
    ], blank=True, null=True, verbose_name="Jobs")

Is there a way to set the default date for the DateBlock to the current date? I have not found anything online about how to do this yet.