我试图找到一种使用python在Windows下修改文件时间戳的简单方法,但网上没有太多清晰的信息。经过一段时间的搜索,我得到了解决方案为了缩短对其他人的搜索,代码如下。
它可能更容易,更美丽,但它的工作原理。我唯一没有解决的问题是夏季时间 - 冬季时间问题,即如果给出夏季时间,则结果相差一小时。也许有人可以添加更正?
from win32file import CreateFile, SetFileTime, GetFileTime, CloseHandle
from win32file import GENERIC_READ, GENERIC_WRITE, OPEN_EXISTING
from pywintypes import Time
import time
import sys
import os
if len(sys.argv)<5:
pfile = os.path.basename(sys.argv[0])
print "USAGE:\n\t%s <createTime> <modifyTime> <accessTime> <FileName>\n" % pfile
print "EXAMPLE:"
print '%s "01.01.2000 00:00:00" "01.01.2000 00:00:00" "01.01.2000 00:00:00" file' % (pfile)
sys.exit()
# get arguments
cTime = sys.argv[1] # create
mTime = sys.argv[2] # modify
aTime = sys.argv[3] # access
fName = sys.argv[4]
# specify time format
format = "%d.%m.%Y %H:%M:%S"
offset = 0 # in seconds
# create struct_time object
cTime_t = time.localtime(time.mktime(time.strptime(cTime,format))+offset)
mTime_t = time.localtime(time.mktime(time.strptime(mTime,format))+offset)
aTime_t = time.localtime(time.mktime(time.strptime(aTime,format))+offset)
# visually check if conversion was ok
print
print "FileName: %s" % fName
print "Create : %s --> %s OK" % (cTime,time.strftime(format,cTime_t))
print "Modify : %s --> %s OK" % (mTime,time.strftime(format,mTime_t))
print "Access : %s --> %s OK" % (aTime,time.strftime(format,aTime_t))
print
# change timestamp of file
fh = CreateFile(fName, GENERIC_READ | GENERIC_WRITE, 0, None, OPEN_EXISTING, 0, 0)
createTime, accessTime, modifyTime = GetFileTime(fh)
print "Change Create from",createTime,"to %s" % (time.strftime(format,cTime_t))
print "Change Modify from",modifyTime,"to %s" % (time.strftime(format,mTime_t))
print "Change Access from",accessTime,"to %s" % (time.strftime(format,aTime_t))
print
createTime = Time(time.mktime(cTime_t))
accessTime = Time(time.mktime(aTime_t))
modifyTime = Time(time.mktime(mTime_t))
SetFileTime(fh, createTime, accessTime, modifyTime)
CloseHandle(fh)
# check if all was ok
ctime = time.strftime(format,time.localtime(os.path.getctime(fName)))
mtime = time.strftime(format,time.localtime(os.path.getmtime(fName)))
atime = time.strftime(format,time.localtime(os.path.getatime(fName)))
print "CHECK MODIFICATION:"
print "FileName: %s" % fName
print "Create : %s" % (ctime)
print "Modify : %s" % (mtime)
print "Access : %s" % (atime)
运用 os.utime
,你可以改变atime,mtime(没有ctime)。
>>> import time
>>> import os
>>> t = time.mktime(time.strptime('16.01.2014 00:00:00', '%d.%m.%Y %H:%M:%S'))
>>> t
1389798000.0
>>> os.utime('..\path\to\file', (t,t)) # <---
>>> os.path.getmtime('..\path\to\file')
1389798000.0
有两个地方你可能想要纠正一个小时的冬/夏差异。在这两种情况下,我们都使用了 tm_isdst
领域,哪个 time.localtime
方便地计算告诉我们是否 夏令时(DST) 对特定的时间戳有效。
输入校正
如果你在夏天设置一个冬季时间戳,反之亦然,它会在匹配季节到来之前减少一个小时,除非你在打电话前补偿 SetFileTime
:
now = time.localtime()
createTime = Time(time.mktime(cTime_t) + 3600 * (now.tm_isdst - cTime_t.tm_isdst))
accessTime = Time(time.mktime(aTime_t) + 3600 * (now.tm_isdst - aTime_t.tm_isdst))
modifyTime = Time(time.mktime(mTime_t) + 3600 * (now.tm_isdst - mTime_t.tm_isdst))
SetFileTime(fh, createTime, accessTime, modifyTime)
输出校正
要使Python报告与Windows资源管理器匹配,我们会在调用之前应用更正 strftime
:
# check if all was ok
now = time.localtime()
ctime = os.path.getctime(fName)
mtime = os.path.getmtime(fName)
atime = os.path.getatime(fName)
ctime += 3600 * (now.tm_isdst - time.localtime(ctime).tm_isdst)
mtime += 3600 * (now.tm_isdst - time.localtime(mtime).tm_isdst)
atime += 3600 * (now.tm_isdst - time.localtime(atime).tm_isdst)
ctime = time.strftime(format,time.localtime(ctime))
mtime = time.strftime(format,time.localtime(mtime))
atime = time.strftime(format,time.localtime(atime))
两个更正
请注意,如果同时应用这两者,您的Python输出似乎将再次与您的输入不匹配。这可能是可取的(见下文),但如果它困扰你:
- 仅供选择 输入校正 如果您更喜欢在一年中的原始时间看起来正确的时间戳。
- 仅供选择 输出校正 如果你习惯看到它们每年两次跳一小时,因为DST生效然后就消失了。
为什么DST如此不一致?
Python和Windows选择了不同的方法来转换UTC和本地时区之间的时间戳:
如果您使用'%Z'在转换后的字符串中包含时区(例如PST与PDT),这很明显,但由于大多数应用程序(包括Windows资源管理器)都没有,因此可能会出现明显的一小时不一致。
例
当使用显式时间代码打印时,很明显每列中的标记确实代表了同一时刻:
File #1 (January) File #2 (June)
2000-01-30 20:00:00 UTC 2000-06-22 20:00:00 UTC
observed in January in California:
2000-01-30 12:00:00 PST 2000-06-30 13:00:00 PDT [Python]
2000-01-30 12:00:00 PST 2000-06-30 12:00:00 PST [Windows]
observed in June in California:
2000-01-30 12:00:00 PST 2000-06-30 13:00:00 PDT [Python]
2000-01-30 13:00:00 PDT 2000-06-30 13:00:00 PDT [Windows]
observed in June in New York:
2000-01-30 15:00:00 EST 2000-06-30 16:00:00 EDT [Python]
2000-01-30 16:00:00 EDT 2000-06-30 16:00:00 EDT [Windows]
如果我们可以请求strftime尊重tm_isdst字段,以匹配Windows资源管理器和显示文件时间戳的大多数其他应用程序,那将是很好的,但至少有一个简单的解决方法来自己进行计算。
def adjustForDST (seconds):
now = time.localtime()
correction = 60*60 * (now.tm_isdst - time.localtime(seconds).tm_isdst)
return seconds + correction
time.strftime(format, time.localtime(adjustforDST(mtime)))
资料来源:
http://bytes.com/topic/python/answers/655606-python-2-5-1-broken-os-stat-module
http://search.cpan.org/~shay/Win32-UTCFileTime-1.58/lib/Win32/UTCFileTime.pm
如果cpan链接再次使用新版本中断,请按以下方式查找:
https://www.google.com/search?q=UTCFileTime.pm