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+You can use `touch` to change modification date or time of a file:
+```
+touch -d 20210703 filename
+
+# Set the times on a file to a specific date and time:
+touch -t YYYYMMDDHHMM.SS filename
+```
+
+
+or use the times from a file to set the times on a second file:
+
+```
+touch -r filename filename2
+```