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Practical Programming in Tcl & Tk, Third Edition by Brent B. Welch

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Year 2000 Convention

The clock command now implements the following standard convention for two-digit year names:

70-99 map to 1970 - 1999.

00-69 map to 2000 - 2069.

Actually, the ability to parse a date value after 2037 and before 1903 may be limited on your system by the size of an integer (e.g., 32-bits) and the clock epoch, which is January 1, 1970 on Windows and most UNIX systems.

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