python中時間戳，datetime 和時間字符串之間得轉換

# datetime時間轉爲字符串
def Changestr(datetime1):
    str1 = datetime1.strftime('%Y-%m-%d %H:%M:%S')
    return str1

# 字符串時間轉爲時間戳
def Changetime(str1):
    Unixtime = time.mktime(time.strptime(str1, '%Y-%m-%d %H:%M:%S'))
    return Unixtime

# datetime時間轉爲時間戳
def Changestamp(dt1):
    Unixtime = time.mktime(time.strptime(dt1.strftime('%Y-%m-%d %H:%M:%S'), '%Y-%m-%d %H:%M:%S'))
    return Unixtime

# 時間戳轉爲datetime時間
def Changedatetime(timestamp):
    dt = datetime.datetime.fromtimestamp(timestamp)
    return dt

# uinx時間戳轉換爲本地時間
def Localtime(datetime1):
    Localtime = time.strftime('%Y-%m-%d %H:%M:%S',time.localtime(datetime1))
    return Localtime

# 字符串時間轉換函數
def Normaltime(datetime1):
    Normaltime = datetime.datetime.strptime(datetime1,'%Y-%m-%d %H:%M:%S')
    return Normaltime

 

import time
import datetime
#  首先將時間字符串處理成標準的，即將小數位去掉
time_stamp = "2019-04-10 00:30:10.198" .split('.')[0]

#  將字符串轉化爲時間戳
h =  time.mktime(time.strptime(time_stamp, "%Y-%m-%d %H:%M:%S"))

#  將時間戳轉換爲字符串
start_time = time.strftime("%Y-%m-%d %H:%M:%S", time.localtime(h-30))
end_time = time.strftime("%Y-%m-%d %H:%M:%S", time.localtime(h+30))

#  將時間字符串轉化爲datetime類型
start_date = datetime.datetime.strptime(start_time, "%Y-%m-%d %H:%M:%S")

#  將時間戳轉化爲datetime類型
t = datetime.datetime.fromtimestamp(h)
print(t,type(t))


print(start_date,type(start_date))