Unity BuildVersion Increment

using UnityEngine;
#if UNITY_EDITOR
using UnityEditor;
#endif

#if UNITY_EDITOR
[CustomEditor(typeof(BuildTime_Update))]
public class BuildTime_UpdateOverride : Editor
{
    public override void OnInspectorGUI()
    {
        BuildTime_Update _buildTemp = (BuildTime_Update)target;
        if(GUILayout.Button("Add Major"))
        {
            _buildTemp.Add_Major();
        }
        if(GUILayout.Button("Add Minor"))
        {
            _buildTemp.Add_Minor();
        }
        if(GUILayout.Button("Add Increment"))
        {
            _buildTemp.Add_Increment();
        }
        if(GUILayout.Button("Test"))
        {
            _buildTemp.Update_BuildNo();
        }
        DrawDefaultInspector();
    }
}
#endif

[ExecuteInEditMode]
public class BuildTime_Update : MonoBehaviour {

    public enum BuildVersionTypes
    {
        DateShort,
        DateLong,
        VersionNo,
    }

    public BuildVersionTypes _current_buildType;

    public int _MajorVersion = 0;
    public int _MinorVersion = 0; // will be auto incremented;
    public int _IncrementVersion = 0;
    public int _IncrementMax = 10; // each time increment version goes past this value, minor version is incremented and increment is reset to 0.

    private int _ios = 1;
    private int _android = 2;
    private int _webGL = 3;
    private int _platform;

    public TMPro.TextMeshProUGUI text;
    public string buildName;

    public void Add_Major(){
        _MajorVersion += 1;
    }

    public void Add_Minor(){
        _MinorVersion += 1;
    }

    public void Add_Increment(){
        _IncrementVersion += 1;
        if (_IncrementMax > 1 && _IncrementVersion > _IncrementMax) {
            _IncrementVersion = 0; _MinorVersion += 1;
        }
    }
    #if UNITY_EDITOR
    public void Update_BuildNo(){
        if (EditorUserBuildSettings.selectedBuildTargetGroup == BuildTargetGroup.Android) {
            _platform = _android;
        }
        if (EditorUserBuildSettings.selectedBuildTargetGroup == BuildTargetGroup.iOS) {
            _platform = _ios;
        }
        if (EditorUserBuildSettings.selectedBuildTargetGroup == BuildTargetGroup.WebGL) {
            _platform = _webGL;
        }

        if(_current_buildType.Equals(BuildVersionTypes.DateShort)){
            buildName = System.DateTime.Now.ToString("yy/MM/dd"); // accurate to the day ..
        }
        if(_current_buildType.Equals(BuildVersionTypes.DateLong)){
            buildName = System.DateTime.Now.ToString("yy/MM/dd HH:MM"); // accurate to the minute ..
        }
        if(_current_buildType.Equals(BuildVersionTypes.VersionNo)){
            buildName = _MajorVersion.ToString("00:") + _MinorVersion.ToString("00:") +  _IncrementVersion.ToString("00:"); // accurate to the minute ..
        }

        if (text != null) {
            if (EditorUserBuildSettings.development == true) {
                text.text = "Build: " + buildName + " " + _platform.ToString();
            } else {
                text.text = "Release: " + buildName + " " + _platform.ToString();
            }
        }
    }
    #endif

    #if UNITY_EDITOR
    public void Awake() {
        if (Application.isEditor && !Application.isPlaying) {
            Add_Increment ();
            Update_BuildNo ();
        }
    }
    #endif
}