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--time-cond puzzle

From: Paul Gilmartin via curl-users <curl-users_at_cool.haxx.se>
Date: Sun, 17 Jan 2021 16:49:46 -0700

With curl:
    1293 $ uname -sr; curl --version | head -1
    Darwin 18.7.0
    curl 7.74.0 (x86_64-apple-darwin18.7.0) libcurl/7.74.0 (SecureTransport) OpenSSL/1.1.1i zlib/1.2.11 brotli/1.0.9 zstd/1.4.8 libidn2/2.3.0 libssh2/1.9.0 nghttp2/1.42.0 librtmp/2.3

And a purposely backdated reference file:
    -rw-r--r-- 1 paulgilm wheel 5340 Oct 31 1984 ./wlvtype?CMSPIP-L.12966
 
I try:
    ifcurl 19+ curl --location --fail --show-error --time-cond './wlvtype?CMSPIP-L.12966' --header 'From: PaulGBoulder_at_AIM.com' --dump-header './wlvtype?CMSPIP-L.12966.headers' --output './wlvtype?CMSPIP-L.12966' 'http://vm.marist.edu/htbin/wlvtype?CMSPIP-L.12966'

The file is not refetched:
    1295 $ ls -l wlv*6
    -rw-r--r-- 1 paulgilm wheel 5340 Oct 31 1984 wlvtype?CMSPIP-L.12966
 
But the headers show a recent modification:
    1296 $ grep Last /dev/null *ers
    wlvtype?CMSPIP-L.12966.headers:Last-Modified: Sun, 17 Jan 2021 18:30:31 -05.00.00

Is that Last-Modified valid syntactically?

Thanks,
gil
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Received on 2021-01-18