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by mynegation 1105 days ago
Let me guess, you are on a Mac.
1 comments
yawaramin 1105 days ago
Probably on an older Mac or FreeBSD. On my macOS 12.6, `man date` says:

    The -I flag was added in FreeBSD 12.0.
link
drivers99 1104 days ago
Yup. macOS Catalina
link