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# -*- coding: utf-8 -*-
#
import calendar
import threading
import time
from email . utils import formatdate
from rest_framework . serializers import BooleanField
_STRPTIME_LOCK = threading . Lock ( )
_GMT_FORMAT = " %a , %d % b % Y % H: % M: % S GMT "
_ISO8601_FORMAT = " % Y- % m- %d T % H: % M: % S.000Z "
def to_unixtime ( time_string , format_string ) :
time_string = time_string . decode ( " ascii " )
with _STRPTIME_LOCK :
return int ( calendar . timegm ( time . strptime ( time_string , format_string ) ) )
def http_date ( timeval = None ) :
""" 返回符合HTTP标准的GMT时间字符串, 用strftime的格式表示就是 " %a , %d % b % Y % H: % M: % S GMT " 。
但不能使用strftime, 因为strftime的结果是和locale相关的。
"""
return formatdate ( timeval , usegmt = True )
def http_to_unixtime ( time_string ) :
""" 把HTTP Date格式的字符串转换为UNIX时间( 自1970年1月1日UTC零点的秒数) 。
HTTP Date形如 `Sat, 05 Dec 2015 11:10:29 GMT` 。
"""
return to_unixtime ( time_string , _GMT_FORMAT )
def iso8601_to_unixtime ( time_string ) :
""" 把ISO8601时间字符串( 形如, 2012-02-24T06:07:48.000Z) 转换为UNIX时间, 精确到秒。 """
return to_unixtime ( time_string , _ISO8601_FORMAT )
def is_true ( value ) :
return value in BooleanField . TRUE_VALUES
def is_false ( value ) :
return value in BooleanField . FALSE_VALUES