datetime和time的时间戳用法

from datetime import datetime

print(datetime.now()) 本地时间
print(datetime.utcnow()) 国际时间

time

#13位或10位时间戳转正常时间。
import time

def timestamp_to_normal_time(timestamp):
    timestamp=str(timestamp)
    if len(timestamp)==13:
        timestamp_10=int(timestamp)/1000 
        
    elif len(timestamp)==10:
        timestamp_10=int(timestamp)
    else:
        return None
    time_array=time.localtime(timestamp_10)
    normal_time = time.strftime("%Y-%m-%d %H:%M:%S", time_array)
    return normal_time

datetime

import datetime
def timestamp_to_normal_time(timestamp):
    timestamp=str(timestamp)
    if len(timestamp)==13:
        timestamp_10=int(timestamp)/1000 
        
    elif len(timestamp)==10:
        timestamp_10=int(timestamp)
    else:
        return None
    time_array=datetime.datetime.fromtimestamp(timestamp_10)
    normal_time = time.strftime("%Y-%m-%d %H:%M:%S", time_array)
    return normal_time

获取时间戳

#10位，秒级
import time
t=int(round(time.time()))
print(t)
>>> 1558769924
#13位，毫秒级，round()函数是四舍五入。
t13=round(time.time()*1000)
print(t13)
>>>1558769647825

#计算时间差
def cal_difftime(date1, date2):
    if is_date(date1) and is_date(date2): 
        date3=datetime.strptime(date1,"%Y-%m-%d %H:%M:%S")  # 字符串转换为datetime类型
        date4=datetime.strptime(date2,"%Y-%m-%d %H:%M:%S")  # 字符串转换为datetime类型
        times = str(date4 - date3).split(':')
        difftime = times[0]+'时'+times[1]+'分'+times[2]+'秒'    
        return difftime

#判断日期是否为合法输入，年月日的格式需要与上面对应，正确返回True，错误返回False，注意大小写。
def is_date(date):
    try:
        datetime.strptime(date,"%Y-%m-%d %H:%M:%S")
        return True
    except:
        return False