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import time

import datetime

timestamp = 1570774556514

# 转换成localtime

time_local = time.localtime(timestamp/1000)

# 转换成新的时间格式(精确到秒)

dt = time.strftime("%Y-%m-%d %H:%M:%S", time_local)

print(dt) # 2019-10-11 14:15:56

d = datetime.datetime.fromtimestamp(timestamp/1000)

# 精确到毫秒

str1 = d.strftime("%Y-%m-%d %H:%M:%S.%f")

print(str1) # 2019-10-11 14:15:56.514000