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[英]How to get min, seconds and milliseconds from datetime.now() in python?
[英]How to get the Modelfield - datetime.now
我一直在努力地對日期進行算術運算。 首先,我得到了兩個datetimeFields(模型)之間的日期,沒關系。 但我想獲得(To_do.end)-datetime.now()
我有兩個datefields的區別:
To_do.objects.annotate(delta = ExpressionWrapper(F('end')-F('start'),output_field = DurationField())
因為我一直在嘗試使用variable = datetime.now()進行相同操作,但仍然沒有得到它
多數民眾贊成在測試中,我試圖獲得成功
def index(request):
myDate = datetime.now()
days_left1 = To_do.objects.annotate(
delta=ExpressionWrapper(F('end') - myDate, output_field=DurationField()))
return render(request, 'ongoingtest.html', {
'myDate': myDate,
'days_left1': days_left1,
})
多數民眾贊成我做了什么來獲得兩個模型領域之間的差異
class HomeView(ListView):
template_name = 'ongoing.html'
model = To_do
def get_queryset(self):
return To_do.objects.annotate(
delta=ExpressionWrapper(F('end') - F('start'), output_field=DurationField())
)
models.py:
class To_do (models.Model):
task = models.CharField(max_length=150)
topic = models.CharField(max_length=150)
how = models.TextField(max_length=600)
start = models.DateTimeField(auto_now_add=True)
end = models.DateTimeField(blank=False)
updated_at = models.DateTimeField(auto_now=True)
def __str__(self):
return self.task
只需獲取To_do.end-datetime.now()
使用Now
數據庫功能: https : //docs.djangoproject.com/en/2.2/ref/models/database-functions/#now
from django.db.models.functions import Now
def index(request):
myDate = datetime.now()
days_left1 = To_do.objects.annotate(
delta=ExpressionWrapper(F('end') - Now(), output_field=DurationField()))
return render(request, 'ongoingtest.html', {
'myDate': myDate,
'days_left1': days_left1,
})
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