时间处理

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from datetime import datetime
# string转datetime类型
time_string = '2018-11-11T11:11:11'
time_datetime = datetime.strptime(time,"%Y-%m-%dT%H:%M:%S")
now = datetime.now()
# 修改datetime格式的时间
today = now.replace(hour=0, minute=0, second=0,microsecond=0)

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def time_transfer(arg):
    try:
        timeArray = time.strptime(arg, "%Y-%m-%d %H:%M:%S")
    except:
        timeArray = time.strptime(arg, "%Y-%m-%d")
    timestamp = time.mktime(timeArray)
    return timestamp
    
def datetime2timestamp(dtime):
    return time.mktime(dtime.timetuple())

def timestamp2datetime(timestamp, convert_to_local=False):
    ''' Converts UNIX timestamp to a datetime object. '''
    if isinstance(timestamp, (int, long, float)):
        dt = datetime.datetime.utcfromtimestamp(timestamp)
        if convert_to_local: # 是否转化为本地时间
            dt = dt + datetime.timedelta(hours=8) # 中国默认时区
        return dt
    return timestamp