Django 时区下时间的操作

当settings.py中开启时区时：

TIME_ZONE = 'Asia/Shanghai'

USE_I18N = True

USE_L10N = True

USE_TZ = True

此时进行时间的对比，写入这些，如果用原生的datetime （系统时间），就会报错

RuntimeWarning: DateTimeField RefundRecord.refund_time received a naive datetime (2017-12-04 16:24:35.860618) while time zone support is active.

因此，需要转换为对应的时区时间

• 不用utc

from django.utils import timezone
now = timezone.now()

• 用utc

from django.utils.timezone import utc
utcnow = datetime.datetime.utcnow().replace(tzinfo=utc)

二者的转化：

def utc2local(utc_st):
    """
    UTC 时间转 系统时间
    :param utc_st: 2017-12-05 18:23:59.585829+08:00
    :return: 2017-12-05 10:22:01
    """
    now_stamp = time.time()
    local_time = datetime.datetime.fromtimestamp(now_stamp)
    utc_time = datetime.datetime.utcfromtimestamp(now_stamp)
    offset = local_time - utc_time
    return utc_st + offset


def local2utc(local_st):
    """
    本地时间 转 UTC时间
    :param local_st: 2017-12-05 10:22:01
    :return: 2017-12-05 18:23:59.585829+08:00
    """
    time_struct = time.mktime(local_st.timetuple())
    utc_st = datetime.datetime.utcfromtimestamp(time_struct)
    return utc_st