Hello,

according to [1], description of start/end format of TZ variable says:
...
Jn
This specifies the Julian day, with n between 1 and 365. February 29 is 
never counted, even in leap years.
n
This specifies the Julian day, with n between 0 and 365. February 29 is 
counted in leap years.
...

This is correct and works. However, man page tzset(3) says:
...
Jn This specifies the Julian day with n between 1 and 365. Febru‐
ary 29 is never counted even in leap years.

n This specifies the Julian day with n between 1 and 365. Febru‐
ary 29 is counted in leap years.
...

For "n" format, interval should be "between 0 and 365". Attached patch 
is solving this issue.

Version of man pages: 3.35


peter


[1] http://www.gnu.org/s/hello/manual/libc/TZ-Variable.html