Limitations, Issues, etc...
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localtime64_r() gets its time zone and daylight savings time information by
-mappping the future year back to a similar one between 2010 and 2037, safe
+mapping the future year back to a similar one between 2010 and 2037, safe
for localtime_r(). The calculations are accurate according to current time
zone and daylight savings information, but may become inaccurate if a
change is made that takes place after 2010.