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diff --git a/os/various/chrtclib.h b/os/various/chrtclib.h
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+++ b/os/various/chrtclib.h
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+/*
+    ChibiOS - Copyright (C) 2014 Uladzimir Pylinsky aka barthess
+
+    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.
+*/
+
+#ifndef _CHRTCLIB_H_
+#define _CHRTCLIB_H_
+
+#include <time.h>
+#include <stdint.h>
+
+/**
+ * @file    chrtclib.h
+ * @brief   Time conversion routines.
+ *
+ * @addtogroup chrtclib
+ * @{
+ */
+
+/**
+ * @brief   Type of a structure representing an RTC date/time stamp.
+ */
+typedef struct {
+  uint32_t      year: 8;            /**< @brief Years since 1980.           */
+  uint32_t      month: 4;           /**< @brief Months 1..12.               */
+  uint32_t      dstflag: 1;         /**< @brief DST correction flag.        */
+  uint32_t      dayofweek: 3;       /**< @brief Day of week 1..7.           */
+  uint32_t      day: 5;             /**< @brief Day of the month 1..31.     */
+  uint32_t      millisecond: 27;    /**< @brief Milliseconds since midnight.*/
+} RTCDateTime;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+  uint32_t rtcConvertDateTimeToFAT(const RTCDateTime *timespec);
+  void rtcConvertDateTimeToStructTm(const RTCDateTime *timespec,
+                                    struct tm *timp);
+  void rtcConvertStructTmToDateTime(const struct tm *timp,
+                                    uint32_t tv_msec,
+                                    RTCDateTime *timespec);
+#ifdef __cplusplus
+}
+#endif
+
+
+#endif /* _CHRTCLIB_H_ */
+
+/** @} */