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-rw-r--r--date.c35
1 files changed, 33 insertions, 2 deletions
diff --git a/date.c b/date.c
index 0ceccbe..a9b59a2 100644
--- a/date.c
+++ b/date.c
@@ -55,6 +55,32 @@ static struct tm *time_to_tm(unsigned long time, int tz)
return gmtime(&t);
}
+/*
+ * What value of "tz" was in effect back then at "time" in the
+ * local timezone?
+ */
+static int local_tzoffset(unsigned long time)
+{
+ time_t t, t_local;
+ struct tm tm;
+ int offset, eastwest;
+
+ t = time;
+ localtime_r(&t, &tm);
+ t_local = my_mktime(&tm);
+
+ if (t_local < t) {
+ eastwest = -1;
+ offset = t - t_local;
+ } else {
+ eastwest = 1;
+ offset = t_local - t;
+ }
+ offset /= 60; /* in minutes */
+ offset = (offset % 60) + ((offset / 60) * 100);
+ return offset * eastwest;
+}
+
const char *show_date(unsigned long time, int tz, enum date_mode mode)
{
struct tm *tm;
@@ -102,6 +128,9 @@ const char *show_date(unsigned long time, int tz, enum date_mode mode)
/* Else fall back on absolute format.. */
}
+ if (mode == DATE_LOCAL)
+ tz = local_tzoffset(time);
+
tm = time_to_tm(time, tz);
if (!tm)
return NULL;
@@ -109,12 +138,14 @@ const char *show_date(unsigned long time, int tz, enum date_mode mode)
sprintf(timebuf, "%04d-%02d-%02d", tm->tm_year + 1900,
tm->tm_mon + 1, tm->tm_mday);
else
- sprintf(timebuf, "%.3s %.3s %d %02d:%02d:%02d %d %+05d",
+ sprintf(timebuf, "%.3s %.3s %d %02d:%02d:%02d %d%c%+05d",
weekday_names[tm->tm_wday],
month_names[tm->tm_mon],
tm->tm_mday,
tm->tm_hour, tm->tm_min, tm->tm_sec,
- tm->tm_year + 1900, tz);
+ tm->tm_year + 1900,
+ (mode == DATE_LOCAL) ? 0 : ' ',
+ tz);
return timebuf;
}