1 files changed, 13 insertions, 0 deletions
diff --git a/datetime.h b/datetime.h
index 6c9d001a..8e2ffbbd 100644
--- a/datetime.h
+++ b/datetime.h
@@ -5,6 +5,19 @@
 
 namespace ledger {
 
+struct interval_t
+{
+  unsigned long years;
+  unsigned long months;
+  unsigned long seconds;
+
+  interval_t(unsigned long _seconds, unsigned long _months,
+	     unsigned long _years)
+    : years(_years), months(_months), seconds(_seconds) {}
+
+  std::time_t increment(const std::time_t);
+};
+
 extern bool parse_date_mask(const char * date_str, struct std::tm * result);
 
 extern bool parse_date(const char * date_str, std::time_t * result,