File system update after DEL?

May 20, 2008
9,184
60
Syracuse, NY, USA
I'm a little surprised. I delete a file and re-create it and it still has a creation date of months ago.
Code:
v:\> echo %@filedate[iffy.btm,c] & del iffy.btm & echo foo > iffy.btm & echo %@filedate[iffy.btm,c]
2017-06-22
Deleting V:\iffy.btm
     1 file deleted
2017-06-22
 
May 20, 2008
9,184
60
Syracuse, NY, USA
I'm sure it's very lazy about removing it from the disk, but I'd expect the FS to be updated immediately. It worked better on another file
Code:
v:\> echo %@filedate[f1.txt,c] & del f1.txt & echo foo > f1.txt & echo %@filedate[f1.txt]
2017-09-15
Deleting V:\f1.txt
     1 file deleted                8,192 bytes freed
2017-10-02
(and on a few more).