Django自定义获取时间过滤器

from django import template
from datetime import datetime

register = template.Library()

@register.filter
def time_since(value):

    if not isinstance(value,datetime):
        print(1)
        return value

    """
        time距离现在的时间间隔
        1. 如果时间间隔小于1分钟以内，那么就显示“刚刚”
        2. 如果是大于1分钟小于1小时，那么就显示“xx分钟前”
        3. 如果是大于1小时小于24小时，那么就显示“xx小时前”
        4. 如果是大于24小时小于30天以内，那么就显示“xx天前”
        5. 以上都不是则返回具体的时间
    """

    now = datetime.now()
    timestamp = (now - value).total_seconds()

    if timestamp < 60:
        return '刚刚'
    elif timestamp > 60 and timestamp < 60*60:
        minutes = int(timestamp / 60)
        return '%s分钟之前'%minutes
    elif timestamp > 60*60 and timestamp < 60*60*24:
        hours = int(timestamp / 60 / 60)
        return '%s小时之前'%hours
    elif timestamp > 60*60*24 and timestamp < 60*60*24*30:
        days = int(timestamp / 60 / 60 / 24)
        return '%s天之前'%days
    else:
        return value.strftime('%Y-%m-%d %H:%M:%S')

# 测试用数据
date_now = datetime(year=2019,month=4,day=1,hour=21,minute=36,second=53)
print(time_since(date_now))