时间相关

class TT(models.Model):
    id = models.AutoField(primary_key=True)
    name = models.CharField(max_length=256, blank=True, null=True)
    shijian = models.DateField(auto_now=True,blank=True) # 最后修改时间,每次自动更新
    chuangjianshijian = models.DateTimeField(auto_now_add=True,blank=True)   # 不可修改时间，第一次创建时间
    jisuanshijian = models.DateField(blank=True,null=True)

　　

from django.core import serializers
import datetime


def tt(request):
    data = request.GET
    data = dict(data)
    print(data)
    real_dict = {}
    for k, v in data.items():
        real_dict[k] = v[0]
    name = real_dict["name"]

    a = datetime.date.today()
    b = a + datetime.timedelta(weeks=1)

    TT.objects.create(name=name, jisuanshijian=b)
    #
    obj = TT.objects.all()
    ret = serializers.serialize("json", obj)
    # return HttpResponse("ok")
    return HttpResponse(ret)

　　

from django.test import TestCase

# Create your tests here.
# import datetime
from datetime import datetime,timedelta,date

a = datetime.strptime('2018-03-02 17:41:20', '%Y-%m-%d %H:%M:%S')

print(type(a))
print(a)
"""
<class 'datetime.datetime'>
2018-03-02 17:41:20
"""


a = datetime.strptime('2018-03-02 17:41:20', '%Y-%m-%d %H:%M:%S')
b = a + timedelta(weeks=1)


print(type(b))
print(b)
"""
<class 'datetime.datetime'>
2018-03-09 17:41:20
"""


a = date.today().isoformat()
print(type(a))
print(a)
"""
<class 'str'>
2019-11-26
"""

a = date.today()
print(type(a))
print(a)
"""
<class 'datetime.date'>
2019-11-26
"""


a = date.today()
b = a + timedelta(weeks=1)
print(type(b))
print(b)
"""
<class 'datetime.date'>
2019-12-03
"""

# import time
# a = time.strftime('%Y-%m-%d',time.localtime(time.time()))
# print(type(a))
# print(a)
"""
<class 'str'>
2019-11-26
"""
str = '2012-11-19'
date_time = datetime.strptime(str,'%Y-%m-%d')
print(type(date_time))
print(date_time)
"""
<class 'datetime.datetime'>
2012-11-19 00:00:00
"""

　　

import datetime

str = '2012-11-19'
datetime_date = datetime.datetime.strptime(str, "%Y-%m-%d")
print(type(datetime_date ), datetime_date )

date_time = datetime.datetime.date(datetime_date)
print(type(date_time), date_time)

"""
<class 'datetime.datetime'> 2012-11-19 00:00:00
<class 'datetime.date'> 2012-11-19
"""

　　

import datetime

str = '2020-11-19'
a = datetime.datetime.strptime(str, "%Y-%m-%d")
print(type(a), a)

b = datetime.datetime.date(a)
print(type(b), b)

c = datetime.date.today()

# if a > c:
#     print("a>c") # 不可以比较
if b > c:  # 可以比较
    print("b>c")
else:
    print("b<c")

“”“
<class 'datetime.datetime'> 2020-11-19 00:00:00
<class 'datetime.date'> 2020-11-19
b>c
”“”

　　

date可以和DateField比较

datetime可以和DateTimeField比较


a = datetime.date.today()
b = a - datetime.timedelta(weeks=1)

取出models对象，直接比较时间的字段
    obj = TT.objects.filter(name="张飞").first()
    if a > obj.shijian:
        print("第一个比较")
    else:
        print("比较也算成功了")

    if b > obj.jisuanshijian:
        print("222第一个比较")
    else:
        print("2222比较也算成功了")