timestamp2datetime and datetime2timestamp

def timestamp2Datetime(timeStamp :int) :
    '''
    时间戳转日期时间
    例如 1557502800转换成 2019-05-10 23:40:00
    '''
    timeArray = time.localtime(timeStamp)
    otherStyleTime = time.strftime("%Y-%m-%d %H:%M:%S", timeArray)
    return otherStyleTime

def timestamp2Date(timeStamp :int) :
    '''
    时间戳转日期
    例如 1557502800转换成 2019-05-10
    '''
    timeArray = time.localtime(timeStamp)
    otherStyleTime = time.strftime("%Y-%m-%d", timeArray)
    return otherStyleTime

print(timestamp2Datetime(1557502800)) 

print(timestamp2Date(1557502800)) 

def _datetime2timestamp(self, datetime_str='2020-01-31 00:00:00', convert_to_utc=True):
    dt = datetime.datetime.strptime(datetime_str,'%Y-%m-%d %H:%M:%S')
    if convert_to_utc:
        dt = dt + datetime.timedelta(hours=8)
    return int(datetime.datetime.timestamp(dt))

from: https://zhuanlan.zhihu.com/p/101978992