diff --git a/src/text_data_sources.yaml b/src/text_data_sources.yaml
index 34ae0c9..f3dcd1b 100644
--- a/src/text_data_sources.yaml
+++ b/src/text_data_sources.yaml
@@ -2,6 +2,7 @@ default:
   file_encoding : 'utf-8'
   separator : 'None'
   table_header : 'None'
+  desired_format: '%Y-%m-%d %H:%M:%S.%f'
 
 RGA:
   table_header : 'Time(s)      Channel#1   Channel#2   Channel#3   Channel#4   Channel#5   Channel#6   Channel#7   Channel#8'
@@ -12,6 +13,7 @@ Pressure:
   table_header : 'Date	Time	Vapore-Pressure 1 in 	Vapore-Pressure 2 in 	Baratron 1 in 	Baratron 2 in 	Baratron 3 in 	Baratron 4 in 	Temp. Ice-Sample in 	Temp. Heated-Sample in 	Temp. Cooler 1 in 	Temp. Cooler 2 in 	Flow  Gas 1 in 	Pressure Chamber in 	X in 	Y in 	Z in 	None in 	Temp. Sealing in 	Flow Ice-Sample in'      
   separator : '\t'
   timestamp: ['0_Date','1_Time']
+  datetime_format: '%d.%m.%Y %H:%M:%S'
   link_to_description: 'src/instrument_descriptions/Preassure.yaml'
 
 Humidity_Sensors:
@@ -19,6 +21,7 @@ Humidity_Sensors:
   separator : '\t'
   file_encoding : 'latin-1'
   timestamp: ['0_Date','1_Time']
+  datetime_format: '%d.%m.%Y %H:%M:%S'
   link_to_description: 'src/instrument_descriptions/Humidity_Sensors.yaml'
 
 ICAD/HONO: 
@@ -26,6 +29,7 @@ ICAD/HONO:
   separator : '\t' 
   file_encoding : 'latin-1'
   timestamp: ['0_Start Date/Time (UTC)'] 
+  datetime_format: '%Y-%m-%d %H:%M:%S.%f'
   link_to_description: 'src/instrument_descriptions/ICAD_HONO.yaml'
 
 ICAD/NO2:
@@ -33,6 +37,7 @@ ICAD/NO2:
   separator : '\t'
   file_encoding : 'latin-1'
   timestamp: ['0_Start Date/Time (UTC)'] 
+  datetime_format: '%Y-%m-%d %H:%M:%S.%f'
   link_to_description: 'src/instrument_descriptions/ICAD_NO2.yaml'
 
 Lopap:
@@ -41,6 +46,7 @@ Lopap:
   separator : ';'
   file_encoding : 'latin-1'
   timestamp: ['0_Date','1_Time']
+  datetime_format: '%d.%m.%Y %H:%M:%S'
   link_to_description: 'src/instrument_descriptions/Lopap.yaml'
 
 T200_NOx: 
@@ -48,6 +54,7 @@ T200_NOx:
   separator : '\t' 
   file_encoding : 'latin-1' 
   timestamp: ['0_Date','1_Time']
+  datetime_format: '%d.%m.%Y %H:%M:%S'
   link_to_description: 'src/instrument_descriptions/T200_NOx.yaml'
 
 T360U_CO2: 
@@ -55,6 +62,7 @@ T360U_CO2:
   separator : '\t' 
   file_encoding : 'latin-1' 
   timestamp: ['0_Date','1_Time']
+  datetime_format: '%d.%m.%Y %H:%M:%S'
   link_to_description: 'src/instrument_descriptions/T360U_CO2.yaml'
 
 smps:
@@ -62,6 +70,7 @@ smps:
   separator : '\t'
   file_encoding : 'latin-1'
   timestamp: ['1_Date','2_Start Time']
+  datetime_format: '%d/%m/%Y %H:%M:%S'
   link_to_description: 'src/instrument_descriptions/smps.yaml'  
 
 gas:
@@ -69,4 +78,5 @@ gas:
   separator : '\t'
   file_encoding : 'utf-8'
   timestamp: ['0_Date_Time']
+  datetime_format: '%Y.%m.%d %H:%M:%S'
   link_to_description: 'src/instrument_descriptions/gas.yaml'
\ No newline at end of file