From f1e9c548ce45005521892af0299696204ece286b Mon Sep 17 00:00:00 2001 From: Michael J Gruber Date: Wed, 20 Apr 2011 11:12:11 +0200 Subject: [PATCH] date: avoid "X years, 12 months" in relative dates 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 Signed-off-by: Michael J Gruber Signed-off-by: Junio C Hamano --- date.c | 5 +++-- t/t0006-date.sh | 1 + 2 files changed, 4 insertions(+), 2 deletions(-) diff --git a/date.c b/date.c index 00f9eb5d0..896fbb480 100644 --- a/date.c +++ b/date.c @@ -129,8 +129,9 @@ const char *show_date_relative(unsigned long time, int tz, } /* Give years and months for 5 years or so */ if (diff < 1825) { - unsigned long years = diff / 365; - unsigned long months = (diff % 365 + 15) / 30; + unsigned long totalmonths = (diff * 12 * 2 + 365) / (365 * 2); + unsigned long years = totalmonths / 12; + unsigned long months = totalmonths % 12; int n; n = snprintf(timebuf, timebuf_size, "%lu year%s", years, (years > 1 ? "s" : "")); diff --git a/t/t0006-date.sh b/t/t0006-date.sh index 1d4d0a5c7..f87abb5a0 100755 --- a/t/t0006-date.sh +++ b/t/t0006-date.sh @@ -25,6 +25,7 @@ check_show 37500000 '1 year, 2 months ago' check_show 55188000 '1 year, 9 months ago' check_show 630000000 '20 years ago' check_show 31449600 '12 months ago' +check_show 62985600 '2 years ago' check_parse() { echo "$1 -> $2" >expect -- 2.30.2