When relative dates are more than about a year ago, we start
writing them as "Y years, M months". At the point where we
calculate Y and M, we have the time delta specified as a
number of days. We calculate these integers as:
Y = days / 365
M = (days % 365 + 15) / 30
This rounds days in the latter half of a month up to the
nearest month, so that day 16 is "1 month" (or day 381 is "1
year, 1 month").
We don't round the year at all, though, meaning we can end
up with "1 year, 12 months", which is silly; it should just
be "2 years".
Implement this differently with months of size
onemonth = 365/12
so that
totalmonths = (long)( (days + onemonth/2)/onemonth )
years = totalmonths / 12
months = totalmonths % 12
In order to do this without floats, we write the first formula as
totalmonths = (days*12*2 + 365) / (365*2)
Tests and inspiration by Jeff King.
Helped-by: Jeff King <peff@peff.net>
Signed-off-by: Michael J Gruber <git@drmicha.warpmail.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
POSIX requires that both the timezone "standard" and "offset" be specified
in the TZ environment variable. This causes a problem on IRIX which does
not understand the timezone 'EST'.
Signed-off-by: Brandon Casey <casey@nrlssc.navy.mil>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
When no timezone is specified, we deduce the offset by
subtracting the result of mktime from our calculated
timestamp.
However, our timestamp is stored as an unsigned integer,
meaning we perform the subtraction as unsigned. For a
negative offset, this means we wrap to a very high number,
and our numeric timezone is in the millions of hours. You
can see this bug by doing:
$ TZ=EST \
GIT_AUTHOR_DATE='2010-06-01 10:00' \
git commit -a -m foo
$ git cat-file -p HEAD | grep author
author Jeff King <peff@peff.net> 1275404416 +119304128
Instead, we should perform this subtraction as a time_t, the
same type that mktime returns.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Previously, test-date simply ignored the parsed timezone and
told show_date() to use UTC. Instead, let's print out what
we actually parsed.
While we're at it, let's make it easy for tests to work in a specific
timezone.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This fixes '--relative-date' so that it does not give '0
year, 12 months', for the interval 360 <= diff < 365.
Signed-off-by: Johan Sageryd <j416@1616.se>
Signed-off-by: Jeff King <peff@peff.net>
These were broken by b5373e9. The problem is that the code
marks the month and year with "-1" for "we don't know it
yet", but the month and year code paths were not adjusted to
fill in the current time before doing their calculations
(whereas other units follow a different code path and are
fine).
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Until now, there was no coverage of relative date printing
or approxidate parsing routines (mainly because we had no
way of faking the "now" time for relative date calculations,
which made consistent testing impossible).
This new script tries to exercise the basic features of
show_date and approxidate. Most of the tests are just "this
obvious thing works" to prevent future regressions, with a
few exceptions:
- We confirm the fix in 607a9e8 that relative year/month
dates in the latter half of a year round correctly.
- We confirm that the improvements in b5373e9 and 1bddb25
work.
- A few tests are marked to expect failure, which are
regressions recently introduced by the two commits
above.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
