From 014514a4dae28e0815dad21501925c3791299dde Mon Sep 17 00:00:00 2001
From: Stefan Thomas <justmoon@members.fsf.org>
Date: Sat, 25 Jan 2014 00:18:57 -0800
Subject: [PATCH] Add a utility function for converting back from JS time to
 Ripple epoch.

---
 src/js/ripple/utils.js | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/js/ripple/utils.js b/src/js/ripple/utils.js
index 07eca14e..966d9d18 100644
--- a/src/js/ripple/utils.js
+++ b/src/js/ripple/utils.js
@@ -137,6 +137,19 @@ function toTimestamp(rpepoch) {
   return (rpepoch + 0x386D4380) * 1000;
 };
 
+/**
+ * Convert a JavaScript timestamp or Date to a Ripple epoch.
+ *
+ * JavaScript timestamps are unix epoch in milliseconds.
+ */
+function fromTimestamp(rpepoch) {
+  if (rpepoch instanceof Date) {
+    rpepoch = rpepoch.getTime();
+  }
+
+  return Math.round(rpepoch/1000) - 0x386D4380;
+};
+
 exports.trace         = trace;
 exports.arraySet      = arraySet;
 exports.hexToString   = hexToString;
@@ -148,6 +161,7 @@ exports.logObject     = logObject;
 exports.assert        = assert;
 exports.arrayUnique   = arrayUnique;
 exports.toTimestamp   = toTimestamp;
+exports.fromTimestamp = fromTimestamp;
 
 // Going up three levels is needed to escape the src-cov folder used for the
 // test coverage stuff.