Python默認起始時間

Python默認起始時間爲1970-01-01 08:00:00

代碼驗證

import time
t = 0
print(time.localtime(t))
print(time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(t)))

打印結果

time.struct_time(tm_year=1970, tm_mon=1, tm_mday=1, tm_hour=8, tm_min=0, tm_sec=0, tm_wday=3, tm_yday=1, tm_isdst=0)
1970-01-01 08:00:00

相關應用

Python時間和毫秒互轉

https://blog.csdn.net/Yellow_python/article/details/104492510

import datetime

def str2date(s, fmt='%Y年%m月%d日'):
    return datetime.datetime.strptime(s, fmt)

def date2float(d):
    return d.timestamp()

def date2millisecond(d):
    return int(date2float(d) * 1000)

def float2date(f):
    return datetime.datetime.fromtimestamp(f)

def millisecond2date(ms):
    return float2date(ms / 1000)

def date2str(d, fmt='%Y-%m-%d %H:%M:%S'):
    return d.strftime(fmt)

Oracle時間和毫秒互轉

日期 -> 毫秒

SELECT
TO_NUMBER(
TO_DATE('2020-5-15 23:0:0','YYYY-MM-DD HH24:MI:SS')-TO_DATE('1970-01-01 8:0:0','YYYY-MM-DD HH24:MI:SS')
)*24*60*60*1000
FROM dual;

毫秒 -> 日期

SELECT
TO_CHAR(
1589554800000/(1000*60*60*24)+TO_DATE('1970-01-01 08:00:00','YYYY-MM-DD HH:MI:SS'),'YYYY-MM-DD HH24:MI:SS'
)FROM dual;