- book
  - views.py
  - urls.py
  - models.py
  - templatetags
    - my_filter.py

from django import template

# 創(chuàng)建模板庫對象
register = template.Library()

# 過濾器函數(shù)
def mycut(value,mystr):
  return value.replace(mystr)
# 將函數(shù)注冊到模板庫中
register.filter("mycut",mycut)

{% load my_filter %}

# time_filter.py文件

from datetime import datetime
from django import template

register = template.Library()

def time_since(value):
  """
  time距離現(xiàn)在的時間間隔
  1\. 如果時間間隔小于1分鐘以內(nèi)，那么就顯示“剛剛”
  2\. 如果是大于1分鐘小于1小時，那么就顯示“xx分鐘前”
  3\. 如果是大于1小時小于24小時，那么就顯示“xx小時前”
  4\. 如果是大于24小時小于30天以內(nèi)，那么就顯示“xx天前”
  5\. 否則就是顯示具體的時間 2017/10/20 16:15
  """
  if isinstance(value,datetime):
    now = datetime.now()
    timestamp = (now - value).total_seconds()
    if timestamp < 60:
      return "剛剛"
    elif timestamp >= 60 and timestamp < 60*60:
      minutes = int(timestamp / 60)
      return "%s分鐘前" % minutes
    elif timestamp >= 60*60 and timestamp < 60*60*24:
      hours = int(timestamp / (60*60))
      return "%s小時前" % hours
    elif timestamp >= 60*60*24 and timestamp < 60*60*24*30:
      days = int(timestamp / (60*60*24))
      return "%s天前" % days
    else:
      return value.strftime("%Y/%m/%d %H:%M")
  else:
    return value

register.filter("time_since",time_since)

{% load time_filter %}
...
{% value|time_since %}
...

from django import template
register = template.Library()

@register.filter(name='mycut')
def mycut(value,mystr):
  return value.replace(mystr,"")