add：

（1）在生成的300tc定标文件中添加生成时间；
（2）添加版本号：2.1；

1.1radiance_calibration_300tc.py

@@ -13,6 +13,7 @@ import sys, traceback
 from osgeo import gdal
 from scipy.interpolate import interp1d
 import spectral
+import time
 
 from PyQt5.QtWidgets import QMainWindow, QFileDialog, QApplication
 from PyQt5.QtCore import Qt
@@ -155,6 +156,7 @@ class RadianceCalibration():
     def write_fields_to_hdrfile(self, fields, hdr_file):
         header_tmp = spectral.envi.read_envi_header(hdr_file)
 
+        fields['generated time'] = time.strftime('%Y-%m-%d %H:%M:%S', time.localtime())
         with open(hdr_file, "a", encoding='utf-8') as f:
             for key in fields.keys():
                 if key in header_tmp or key == "description":