diff --git a/data/Level0/Lake_Greifen_CTD_W_2021-01-18.txt b/data/Level0/Lake_Greifen_CTD_W_2021-01-18.txt
index 98185cc2ba132cbe4d34648bccf71b01d9e6856a..1f1d5d0b9a1124dcc3cd00db9bddd80e6a8ba0e4 100644
--- a/data/Level0/Lake_Greifen_CTD_W_2021-01-18.txt
+++ b/data/Level0/Lake_Greifen_CTD_W_2021-01-18.txt
@@ -1,3 +1,3 @@
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diff --git a/data/Level1A/Lake_Greifen_CTD_W_2021-01-18.nc b/data/Level1A/Lake_Greifen_CTD_W_2021-01-18.nc
index b228766292c7fae4bdcced8dfc8a791c9f7ab81e..5c525b80ee350dcda153b9ec48bd8830f235e035 100644
--- a/data/Level1A/Lake_Greifen_CTD_W_2021-01-18.nc
+++ b/data/Level1A/Lake_Greifen_CTD_W_2021-01-18.nc
@@ -1,3 +1,3 @@
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diff --git a/notebooks/lastupdated.ini b/notebooks/lastupdated.ini
index e6eb102b6a944469d9d87972751b4476f2aca247..7ebd152e0fcc739e446bd25c10d61bdab87c173e 100644
--- a/notebooks/lastupdated.ini
+++ b/notebooks/lastupdated.ini
@@ -1,3 +1,3 @@
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+datetime = 2021-01-23T00:00:00Z