diff -r 000000000000 -r 6474c204b198 js/src/prmjtime.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/prmjtime.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,49 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: set ts=8 sts=4 et sw=4 tw=99:
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef prmjtime_h
+#define prmjtime_h
+
+#include <stddef.h>
+#include <stdint.h>
+
+/*
+ * Broken down form of 64 bit time value.
+ */
+struct PRMJTime {
+    int32_t tm_usec;            /* microseconds of second (0-999999) */
+    int8_t tm_sec;              /* seconds of minute (0-59) */
+    int8_t tm_min;              /* minutes of hour (0-59) */
+    int8_t tm_hour;             /* hour of day (0-23) */
+    int8_t tm_mday;             /* day of month (1-31) */
+    int8_t tm_mon;              /* month of year (0-11) */
+    int8_t tm_wday;             /* 0=sunday, 1=monday, ... */
+    int32_t tm_year;            /* absolute year, AD */
+    int16_t tm_yday;            /* day of year (0 to 365) */
+    int8_t tm_isdst;            /* non-zero if DST in effect */
+};
+
+/* Some handy constants */
+#define PRMJ_USEC_PER_SEC       1000000L
+#define PRMJ_USEC_PER_MSEC      1000L
+
+/* Return the current local time in micro-seconds */
+extern int64_t
+PRMJ_Now(void);
+
+/* Release the resources associated with PRMJ_Now; don't call PRMJ_Now again */
+#if defined(JS_THREADSAFE) && defined(XP_WIN)
+extern void
+PRMJ_NowShutdown(void);
+#else
+#define PRMJ_NowShutdown()
+#endif
+
+/* Format a time value into a buffer. Same semantics as strftime() */
+extern size_t
+PRMJ_FormatTime(char *buf, int buflen, const char *fmt, PRMJTime *tm);
+
+#endif /* prmjtime_h */