Add GetProgramDateTimeEpoch and GetProgramDateTimeString

Added functions to retrieve program date and time information.

Author: OskarFreestyle

hisplayer-api.md

@@ -402,6 +402,12 @@ Obtain the language of a certain audio of a certain player. The playerIndex is a
 #### void SelectAudioTrack(int playerIndex, int audioTrackIndex)
 Select a certain audio-track of a certain stream to be used. Before using this functions is recommended to use GetAudioTrackList in order to know all the information about the audio-tracks. The playerIndex is associated with the index of the element of Multi Stream Properties, e.g. the index 0 is the element 0 in the list.
 
+#### long GetProgramDateTimeEpoch(int playerIndex)
+Get the epoch time (in seconds since 1970) of the first EXT-X-PROGRAM-DATE-TIME tag of a certain player in seconds. Only available for HLS manifests that have the tag information. The **playerIndex** is associated with the index of the element of **Multi Stream Properties**, e.g. the index 0 is the element 0 in the list.
+
+#### string GetProgramDateTimeString(int playerIndex)
+Get the EXT-X-PROGRAM-DATE-TIME value seen in the manifest of a certain player. Only available for HLS manifests that have the tag information. The **playerIndex** is associated with the index of the element of **Multi Stream Properties**, e.g. the index 0 is the element 0 in the list.
+
 #### void SetLogLevel(LogLevel logLevel)
 Establishes the amount of logs to be shown.
 **logLevel**: The log level to be used: 0->DEBUG, 1->INFO, 2->WARNING, 3->ERROR, 4->NONE