OpenACS

- enforce that only dates in the ISO format "%Y-%m-%d %H:%M:%S" are accepted

- apply clock api normalization to seemingly out of range time_values, as per https://www.tcl.tk/man/tcl/TclCmd/clock.html#M25

- return the empty string every time input is invalid or a conversion cannot be determined

- return a value, as ISO date, only when conversion is successful

- prefer the clock api to perform the conversion, but fall back to the ref-timezones datamodel when the timezone is not supported by Tcl

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