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diff --git a/os/various/chrtclib.h b/os/various/chrtclib.h
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+/*
+    ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+        http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+*/
+/*
+   Concepts and parts of this file have been contributed by Uladzimir Pylinsky
+   aka barthess.
+ */
+
+/**
+ * @file    chrtclib.h
+ * @brief   RTC time conversion utilities header.
+ *
+ * @addtogroup chrtclib
+ * @{
+ */
+
+#ifndef CHRTCLIB_H_
+#define CHRTCLIB_H_
+
+#include <time.h>
+
+/*===========================================================================*/
+/* External declarations.                                                    */
+/*===========================================================================*/
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+#if !STM32_RTC_IS_CALENDAR
+  uint32_t rtcGetTimeFat(RTCDriver *rtcp);
+#endif
+  void rtcGetTimeTm(RTCDriver *rtcp, struct tm *timp);
+  void rtcSetTimeTm(RTCDriver *rtcp, struct tm *timp);
+  time_t rtcGetTimeUnixSec(RTCDriver *rtcp);
+  uint64_t rtcGetTimeUnixUsec(RTCDriver *rtcp);
+  void rtcSetTimeUnixSec(RTCDriver *rtcp, time_t tv_sec);
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* CHRTCLIB_H_ */
+
+/** @} */