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-rw-r--r--e-util/e-time-utils.c61
1 files changed, 56 insertions, 5 deletions
diff --git a/e-util/e-time-utils.c b/e-util/e-time-utils.c
index f91695f977..ecc3fc9602 100644
--- a/e-util/e-time-utils.c
+++ b/e-util/e-time-utils.c
@@ -10,13 +10,17 @@
#include <config.h>
-/* We need this for strptime. */
-#define _XOPEN_SOURCE 500
-#define __USE_XOPEN
+#ifdef __linux__
+/* We need this to get a prototype for strptime. */
+#define _GNU_SOURCE
+#endif /* __linux__ */
+
#include <time.h>
#include <sys/time.h>
-#undef _XOPEN_SOURCE
-#undef __USE_XOPEN
+
+#ifdef __linux__
+#undef _GNU_SOURCE
+#endif /* __linux__ */
#include <string.h>
#include <ctype.h>
@@ -426,3 +430,50 @@ e_time_format_time (struct tm *date_tm,
if (strftime (buffer, buffer_size, format, date_tm) == 0)
buffer[0] = '\0';
}
+
+
+/* Like mktime(3), but assumes UTC instead of local timezone. */
+time_t
+e_mktime_utc (struct tm *tm)
+{
+ time_t tt;
+
+ tm->tm_isdst = -1;
+ tt = mktime (tm);
+
+#if defined (HAVE_TM_GMTOFF)
+ tt += tm->tm_gmtoff;
+#elif defined (HAVE_TIMEZONE)
+ if (tm->tm_isdst > 0) {
+ #if defined (HAVE_ALTZONE)
+ tt -= altzone;
+ #else /* !defined (HAVE_ALTZONE) */
+ tt -= (timezone - 3600);
+ #endif
+ } else
+ tt -= timezone;
+#endif
+
+ return tt;
+}
+
+/* Like localtime_r(3), but also returns an offset in minutes after UTC.
+ (Calling gmtime with tt + offset would generate the same tm) */
+void
+e_localtime_with_offset (time_t tt, struct tm *tm, int *offset)
+{
+ localtime_r (&tt, tm);
+
+#if defined (HAVE_TM_GMTOFF)
+ *offset = tm->tm_gmtoff;
+#elif defined (HAVE_TIMEZONE)
+ if (tm->tm_isdst > 0) {
+ #if defined (HAVE_ALTZONE)
+ *offset = -altzone;
+ #else /* !defined (HAVE_ALTZONE) */
+ *offset = -(timezone - 3600);
+ #endif
+ } else
+ *offset = -timezone;
+#endif
+}