[issue11850] mktime - OverflowError: mktime argument out of range - on very specific time

[JoeKuan]

New submission from JoeKuan :

>>> a = (1970, 1, 1, 0, 59, 58, 0, 0, 0)
>>> time.mktime(a)
-2.0

>>> a = (1970, 1, 1, 0, 59, 59, 0, 0, 0)
>>> time.mktime(a)
Traceback (most recent call last):
  File "", line 1, in 
OverflowError: mktime argument out of range

>>> a = (1970, 1, 1, 1, 0, 0, 0, 0, 0)
>>> time.mktime(a)
0.0

>>> a = (1970, 1, 1, 0, 59, 60, 0, 0, 0)
>>> time.mktime(a)
0.0

--
messages: 133806
nosy: JoeKuan
priority: normal
severity: normal
status: open
title: mktime - OverflowError: mktime argument out of range - on very specific 
time
versions: Python 2.6

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[issue11850] mktime - OverflowError: mktime argument out of range - on very specific time

[JoeKuan]

JoeKuan  added the comment:

I don't think it is to do with the underlying C mktime. Because it works fine 
with 00:59:58 and 01:00:00, 1, Jan 1970. It is to do with some specific value 
-1 in the internal code of time.mktime

Here is the C code.

int main(int argc, char *argv[]) {

struct tm aTime = { 58, 59, 0, 1, 0, 70, 0, 0, 0, 0 };
time_t mTime = mktime(&aTime);
printf("%s\n", ctime(&mTime));

aTime.tm_sec = 59;
mTime = mktime(&aTime);
printf("%s\n", ctime(&mTime));

aTime.tm_sec = 0;
aTime.tm_min = 0;
aTime.tm_hour = 1;
mTime = mktime(&aTime);
printf("%s\n", ctime(&mTime));
}

---
Output from the same machine which gives the python error message


Thu Jan  1 00:59:58 1970

Thu Jan  1 00:59:59 1970

Thu Jan  1 01:00:00 1970

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