There's no specific date, but:
> I started work on Tcl when I returned from my sabbatical early in 1988, and I began using the first version of Tcl in a graphical text editor in the spring of 1988.
web.stanford.edu/~ouster/cgi-b…
> I started work on Tcl when I returned from my sabbatical early in 1988, and I began using the first version of Tcl in a graphical text editor in the spring of 1988.
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