Add Time Zone and Daylight Saving Time Customization for MDF Data

include/mdf/ifilehistory.h

@@ -11,8 +11,10 @@
 #include <cstdint>
 #include <string>
 
-#include "mdf/imetadata.h"
+#include "imdftimestamp.h"
+#include "itimestamp.h"
 #include "mdf/iblock.h"
+#include "mdf/imetadata.h"
 
 namespace mdf {
 
@@ -33,12 +35,30 @@ class IFileHistory : public IBlock {
    */
   virtual void Time(uint64_t ns_since_1970) = 0;
 
+  /**
+   * \brief Sets the time using an ITimestamp object.
+   *
+   * This function sets the time for the history block using an ITimestamp
+   * object.
+   * @param timestamp An ITimestamp object representing the time.
+   */
+  virtual void Time(ITimestamp& timestamp) = 0;
+
   /** \brief Returns the time for the history block.
    *
    * Sets the time the history block was created.
    * @return Nanoseconds since 1970.
    */
   [[nodiscard]] virtual uint64_t Time() const = 0;
+
+  /** \brief Returns the start timestamp of the measurement.
+   *
+   * This function returns the start timestamp of the measurement as a pointer
+   * to an IMdfTimestamp object.
+   * @return Pointer to an IMdfTimestamp object representing the start
+   * timestamp.
+   */
+  [[nodiscard]] virtual const mdf::IMdfTimestamp* StartTimestamp() const = 0;
 
   /** \brief Returns an interface against a MD4 block
    *

include/mdf/iheader.h

@@ -13,6 +13,8 @@
 #include <string>
 #include <vector>
 #include "mdf/iblock.h"
+#include "itimestamp.h"
+#include "imdftimestamp.h"
 
 namespace mdf {
 
@@ -152,13 +154,30 @@ class IHeader : public IBlock {
    */
   virtual void StartTime(uint64_t ns_since_1970) = 0;
 
+  /** \brief Sets the absolute measurement time for the file.
+   *
+   * Sets the absolute start time for the measurement file using an ITimestamp
+   * object.
+   * @param timestamp An ITimestamp object representing the start time.
+   */
+  virtual void StartTime(ITimestamp& timestamp) = 0;
+
   /** \brief Returns the absolute measurement time for the file.
    *
    * Returns the absolute start time for the measurement file.
    * @return Nanoseconds since 1970.
    */
   [[nodiscard]] virtual uint64_t StartTime() const = 0;
 
+  /** \brief Returns the start timestamp of the measurement.
+   *
+   * This function returns the start timestamp of the measurement as a pointer
+   * to an IMdfTimestamp object.
+   * @return Pointer to an IMdfTimestamp object representing the start
+   * timestamp.
+   */
+  [[nodiscard]] virtual const IMdfTimestamp* StartTimestamp() const = 0;
+
   /** \brief Returns meta data information object.
    *
    * Returns meta data as a text string typically as an XML snippets.

include/mdf/imdftimestamp.h

@@ -0,0 +1,55 @@
+#pragma once
+
+#include "mdf/itimestamp.h"
+
+namespace mdf {
+
+namespace timetype
+{
+enum MdfTimestampType {
+ kUtcTime, /**< Represents the UTC time. */
+ kLocalTime, /**< Represents the local time. */
+ kLocalTimeTz, /**< Represents the local time with timezone offset. */
+ kTimezoneTime /**< Represents the time with timezone offset. */
+};
+}
+
+class ITimestamp;
+
+/**
+ * \brief Interface for MDF timestamp handling.
+ */
+class IMdfTimestamp {
+ public:
+  /**
+   * \brief Set the time in nanoseconds.
+   * \param time The time in nanoseconds.
+   */
+  virtual void SetTime(uint64_t time) = 0;
+  /**
+   * \brief Set the time using an ITimestamp object.
+   * \param timestamp An ITimestamp object representing the time.
+   */
+  virtual void SetTime(ITimestamp &timestamp) = 0;
+  /**
+   * \brief Get the time in nanoseconds.
+   * \return The time in nanoseconds.
+   */
+  [[nodiscard]] virtual uint64_t GetTimeNs() const = 0;
+  /**
+   * \brief Get the timezone offset in minutes.
+   * \return The timezone offset in minutes.
+   */
+  [[nodiscard]] virtual uint16_t GetTzOffsetMin() const = 0;
+  /**
+   * \brief Get the daylight saving time offset in minutes.
+   * \return The daylight saving time offset in minutes.
+   */
+  [[nodiscard]] virtual uint16_t GetDstOffsetMin() const = 0;
+  /**
+   * \brief Get the type of MDF timestamp.
+   * \return The MDF timestamp type.
+   */
+  [[nodiscard]] virtual timetype::MdfTimestampType GetTimeType() const = 0;
+};
+}  // namespace mdf

include/mdf/itimestamp.h

@@ -0,0 +1,111 @@
+#pragma once
+#include <string>
+
+namespace mdf {
+
+namespace timeunits {
+constexpr uint64_t kNanosecondsPerSecond = 1'000'000'000;
+constexpr uint64_t kNanosecondsPerMinute = 60 * kNanosecondsPerSecond;
+constexpr uint64_t kNanosecondsPerHour = 60 * kNanosecondsPerMinute;
+constexpr uint32_t kSecondsPerMinute = 60;
+constexpr uint32_t kSecondsPerHour = 60 * kSecondsPerMinute;
+}  // namespace timeunits
+
+/**
+ * \brief Interface for timestamp handling in MDF files.
+ */
+class ITimestamp {
+ public:
+  /**
+   * \brief Virtual destructor for ITimestamp.
+   */
+  virtual ~ITimestamp() = default;
+  /**
+   * \brief Get the time in nanoseconds.
+   * \return Time in nanoseconds.
+   */
+  [[nodiscard]] virtual uint64_t GetTimeNs() const = 0;
+  /**
+   * \brief Get the timezone offset in minutes.
+   * \return Timezone offset in minutes.
+   */
+  [[nodiscard]] virtual int16_t GetTimezoneMin() const = 0;
+  /**
+   * \brief Get the daylight saving time offset in minutes.
+   * \return DST offset in minutes.
+   */
+  [[nodiscard]] virtual int16_t GetDstMin() const = 0;
+  /**
+   * \brief Get the UTC time in nanoseconds.
+   * \return UTC time in nanoseconds.
+   */
+  [[nodiscard]] virtual uint64_t GetUtcTimeNs() const = 0;
+};
+
+/**
+ * \brief Class representing a UTC timestamp.
+ */
+class UtcTimestamp : public ITimestamp {
+ public:
+  /**
+   * \brief Constructor for UtcTimeStamp.
+   * \param utc_timestamp The UTC timestamp in nanoseconds.
+   */
+  explicit UtcTimestamp(uint64_t utc_timestamp);
+
+  [[nodiscard]] uint64_t GetTimeNs() const override;
+  [[nodiscard]] int16_t GetTimezoneMin() const override;
+  [[nodiscard]] int16_t GetDstMin() const override;
+  [[nodiscard]] uint64_t GetUtcTimeNs() const override;
+
+ private:
+  uint64_t utc_timestamp_;  ///< The UTC timestamp in nanoseconds.
+};
+
+/**
+ * \brief Class representing a local timestamp, with timezone and DST offset.
+ */
+class LocalTimestamp : public ITimestamp {
+ public:
+  /**
+   * \brief Constructor for LocalTimeStamp.
+   * \param local_timestamp The local timestamp in nanoseconds, with timezone
+   * and DST offset.
+   */
+  explicit LocalTimestamp(uint64_t local_timestamp);
+  [[nodiscard]] uint64_t GetTimeNs() const override;
+  [[nodiscard]] int16_t GetTimezoneMin() const override;
+  [[nodiscard]] int16_t GetDstMin() const override;
+  [[nodiscard]] uint64_t GetUtcTimeNs() const override;
+
+ private:
+  uint64_t local_timestamp_;  ///< The local timestamp in nanoseconds, with
+                              ///< timezone and DST offset.
+  int16_t timezone_offset_min_ = 0;  ///< The timezone offset in minutes.
+  int16_t dst_offset_min_ = 0;  ///< The daylight saving time offset in minutes.
+};
+
+/**
+ * \brief Class representing a timestamp with timezone information.
+ */
+class TimezoneTimestamp : public ITimestamp {
+ public:
+  /**
+   * \brief Constructor for TimezoneTimeStamp.
+   * \param utc_timestamp The UTC timestamp in nanoseconds.
+   * \param timezone_offset_min The timezone offset in minutes.
+   * \param dst_offset_min The daylight saving time offset in minutes.
+   */
+  TimezoneTimestamp(uint64_t utc_timestamp, int16_t timezone_offset_min,
+                    int16_t dst_offset_min);
+  [[nodiscard]] uint64_t GetTimeNs() const override;
+  [[nodiscard]] int16_t GetTimezoneMin() const override;
+  [[nodiscard]] int16_t GetDstMin() const override;
+  [[nodiscard]] uint64_t GetUtcTimeNs() const override;
+
+ private:
+  uint64_t utc_timestamp_;       ///< The UTC timestamp in nanoseconds.
+  int16_t timezone_offset_min_;  ///< The timezone offset in minutes.
+  int16_t dst_offset_min_;  ///< The daylight saving time offset in minutes.
+};
+}  // namespace mdf

include/mdf/mdfhelper.h

@@ -16,7 +16,7 @@ class MdfHelper {
  public:
   /** \brief Adds the time zone offset to the time stamp.
    *
-   * Adds the time zone offset to the UTC nanoseconds since 1970.
+   * Adds the time zone offset and dst to the UTC nanoseconds since 1970.
    * @param [in] ns_since_1970 Nano-seconds since 1970
    * @return local time = system time + time zone offset
    */
@@ -29,6 +29,23 @@ class MdfHelper {
    */
   static int64_t TimeZoneOffset();
 
+  /**
+   * \brief Returns the GMT offset in nanoseconds.
+   *
+   * This function returns the current GMT offset in nanoseconds.
+   * @return GMT offset in nanoseconds.
+   */
+  static int64_t GmtOffsetNs();
+
+  /**
+   * \brief Returns the daylight saving time (DST) offset in nanoseconds.
+   *
+   * This function returns the current daylight saving time (DST) offset in
+   * nanoseconds.
+   * @return DST offset in nanoseconds.
+   */
+  static int64_t DstOffsetNs();
+
   /** \brief Converts a nanosecond since 1970 to a local ISO date and time
    * string.
    *
@@ -124,6 +141,58 @@ class MdfHelper {
    * @return Local date format 'HH:MM:SS'
    */
   static std::string NanoSecToHHMMSS(uint64_t ns_since_1970);
+
+  /** \brief Converts ns since 1970 UTC to UTC time in 'HH:MM:SS' format.
+ *
+ * Generates a UTC time string in the 'HH:MM:SS' format from a timestamp 
+ * representing nanoseconds since 1970-01-01 (midnight) UTC. This is useful for 
+ * converting a high-precision timestamp to a human-readable time format in UTC.
+ *
+ * @param [in] timestamp_ns Nanoseconds since 1970 UTC.
+ * @return UTC time format 'HH:MM:SS'.
+   */
+  static std::string NanoSecUtcToHHMMSS(uint64_t timestamp_ns);
+
+  /** \brief Converts ns since 1970 UTC to UTC date in 'DD/MM/YYYY' format.
+ *
+ * Generates a UTC date string in the 'DD/MM/YYYY' format from a timestamp 
+ * representing nanoseconds since 1970-01-01 (midnight) UTC. This function is 
+ * useful for converting a high-precision timestamp into a human-readable date in UTC.
+ *
+ * @param [in] timestamp_ns Nanoseconds since 1970 UTC.
+ * @return UTC date format 'DD/MM/YYYY'.
+   */
+  static std::string NanoSecUtcToDDMMYYYY(uint64_t timestamp_ns);
+
+  /** \brief Converts ns since 1970 UTC to a time string in 'HH:MM:SS' format in a specified timezone.
+ *
+ * Generates a time string in the 'HH:MM:SS' format based on a timestamp 
+ * representing nanoseconds since 1970-01-01 (midnight) UTC, adjusted for a 
+ * specified timezone and daylight saving time (DST) offset. This function 
+ * is useful for converting a high-precision timestamp into a human-readable 
+ * time in a specific timezone.
+ *
+ * @param [in] timestamp_ns Nanoseconds since 1970 UTC.
+ * @param [in] tz_offset_min Timezone offset in minutes from UTC.
+ * @param [in] dst_offset_min Daylight saving time (DST) offset in minutes.
+ * @return Time format 'HH:MM:SS' adjusted for the specified timezone and DST offset.
+   */
+  static std::string NanoSecTzToHHMMSS(uint64_t timestamp_ns, int16_t tz_offset_min, int16_t dst_offset_min);
+
+  /** \brief Converts ns since 1970 UTC to a date string in 'DD/MM/YYYY' format in a specified timezone.
+ *
+ * Generates a date string in the 'DD/MM/YYYY' format based on a timestamp 
+ * representing nanoseconds since 1970-01-01 (midnight) UTC, adjusted for a 
+ * specified timezone and daylight saving time (DST) offset. This function 
+ * is useful for converting a high-precision timestamp into a human-readable 
+ * date in a specific timezone.
+ *
+ * @param [in] timestamp_ns Nanoseconds since 1970 UTC.
+ * @param [in] tz_offset_min Timezone offset in minutes from UTC.
+ * @param [in] dst_offset_min Daylight saving time (DST) offset in minutes.
+ * @return Date format 'DD/MM/YYYY' adjusted for the specified timezone and DST offset.
+   */
+  static std::string NanoSecTzToDDMMYYYY(uint64_t timestamp_ns, int16_t tz_offset_min, int16_t dst_offset_min);
 
   /** \brief Remove white space from string.
    *

include/mdf/mdfwriter.h

@@ -204,8 +204,14 @@ class MdfWriter {
 
   /** \brief Starts the measurement. */
   virtual void StartMeasurement(uint64_t start_time);
+
+  /** \brief Starts the measurement. */
+  virtual void StartMeasurement(ITimestamp &start_time);
   /** \brief Stops the measurement. */
   virtual void StopMeasurement(uint64_t stop_time);
+  /** \brief Stops the measurement. */
+  virtual void StopMeasurement(ITimestamp &start_time);
+
   /** \brief Stop the sample queue and write all unwritten blocks to
    * the file.*/
   virtual bool FinalizeMeasurement();

mdflib/CMakeLists.txt

@@ -99,6 +99,11 @@ add_library(mdf
         src/cgrange.h
         src/mdfconverter.cpp
         src/mdfconverter.h
+        src/timestamp.cpp
+        ../include/mdf/imdftimestamp.h
+        src/timestamp.cpp
+        src/mdf3timestamp.cpp
+        src/mdf3timestamp.h
 )
 
 set(CMAKE_POSITION_INDEPENDENT_CODE ${BUILD_SHARED_LIBS})

mdflib/mdflib.vcxproj

@@ -243,6 +243,7 @@
     <ClCompile Include="src\littlebuffer.cpp" />
     <ClCompile Include="src\md4block.cpp" />
     <ClCompile Include="src\mdf3file.cpp" />
+    <ClCompile Include="src\mdf3timestamp.cpp" />
     <ClCompile Include="src\mdf3writer.cpp" />
     <ClCompile Include="src\mdf4file.cpp" />
     <ClCompile Include="src\mdf4timestamp.cpp" />
@@ -266,6 +267,7 @@
     <ClCompile Include="src\si4block.cpp" />
     <ClCompile Include="src\sr3block.cpp" />
     <ClCompile Include="src\sr4block.cpp" />
+    <ClCompile Include="src\timestamp.cpp" />
     <ClCompile Include="src\tr3block.cpp" />
     <ClCompile Include="src\tx3block.cpp" />
     <ClCompile Include="src\tx4block.cpp" />
@@ -343,6 +345,7 @@
     <ClInclude Include="src\littlebuffer.h" />
     <ClInclude Include="src\md4block.h" />
     <ClInclude Include="src\mdf3file.h" />
+    <ClInclude Include="src\mdf3timestamp.h" />
     <ClInclude Include="src\mdf3writer.h" />
     <ClInclude Include="src\mdf4file.h" />
     <ClInclude Include="src\mdf4timestamp.h" />