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-rw-r--r--src/libical/icaltime.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/libical/icaltime.h b/src/libical/icaltime.h
index ca69724f..e7c7d1a2 100644
--- a/src/libical/icaltime.h
+++ b/src/libical/icaltime.h
@@ -198,6 +198,8 @@ LIBICAL_ICAL_EXPORT struct icaltimetype icaltime_from_day_of_year(const int doy,
* This function probably won't do what you expect. In particular, you should
* only pass an icaltime in UTC, since no conversion is done. Even in that case,
* it's probably better to just use icaltime_as_timet_with_zone().
+ *
+ * The return value is defined for dates starting with 1902-01-01 until 10000-01-01 (excl.).
*/
LIBICAL_ICAL_EXPORT time_t icaltime_as_timet(const struct icaltimetype);