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# -*- coding: utf-8 -*-
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#
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import time
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from email.utils import formatdate
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import calendar
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import threading
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_STRPTIME_LOCK = threading.Lock()
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_GMT_FORMAT = "%a, %d %b %Y %H:%M:%S GMT"
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_ISO8601_FORMAT = "%Y-%m-%dT%H:%M:%S.000Z"
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def to_unixtime(time_string, format_string):
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time_string = time_string.decode("ascii")
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with _STRPTIME_LOCK:
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return int(calendar.timegm(time.strptime(time_string, format_string)))
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def http_date(timeval=None):
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"""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"。
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但不能使用strftime，因为strftime的结果是和locale相关的。
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"""
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return formatdate(timeval, usegmt=True)
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def http_to_unixtime(time_string):
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"""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）。
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HTTP Date形如 `Sat, 05 Dec 2015 11:10:29 GMT` 。
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"""
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return to_unixtime(time_string, _GMT_FORMAT)
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def iso8601_to_unixtime(time_string):
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"""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。"""
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return to_unixtime(time_string, _ISO8601_FORMAT)
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