【Python】Django 时间字段 最佳实践

Model定义：

class Test(models.Model):
    id = models.AutoField(primary_key=True)
    name = models.CharField(max_length=128, unique=True, db_index=True)
    #create_time = models.DateTimeField(auto_now_add=True, db_index=True)
    #update_time = models.DateTimeField(auto_now=True, db_index=True)
    create_time = models.DateTimeField(default=timezone.now, db_index=True)
    update_time = models.DateTimeField(default=timezone.now)
    description = models.TextField(null=False, blank=True)

datetime转化为时间戳：

from datetime import datetime
from django.utils import timezone
from django.utils.timezone import utc

time.mktime(timezone.now().timetuple())

时间戳转化为datetime：

datetime.utcfromtimestamp(1476321626.0).replace(tzinfo=utc)

参考资料：

http://stackoverflow.com/questions/13225890/django-default-timezone-now-saves-records-using-old-time

时间戳与datetime相互转换：http://blog.sina.com.cn/s/blog_771875550101jfw2.html