convert Date to milliseconds

Hello everyone I want to convert my Date from string to milliseconds

this is my models.py class 

class mail_item_count_deliveries_perDate(models.Model):

   countDeliveries = models.IntegerField(default=0)

   Date = models.DateTimeField()

this is my views.py 

def jsonDeliv(request):

 

 dataset = mail_item_count_deliveries_perDate.objects.all().values_list('Date','countDeliveries')

 data = list(dataset)

 

 return JsonResponse(data, safe=False)

this is how the data looks like 

[["2020-05-21T00:00:00Z", 5], ["2019-05-21T00:00:00Z", 1], ["2020-04-06T00:00:00Z", 3], ["2020-02-10T00:00:00Z", 2], ["2020-01-23T00:00:00Z", 4],

I want to convert the Date to milliseconds I want to use it in stock highchart , and I don't know how to do it here can you guys help me please 

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