Description:
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PHP Version 5.5.9-1ubuntu4.5

Everytime when I refresh the page it shows different result.
Generally
Friday 22 December 1978
and sometimes
Cuma 22 Şubat 1978

But it's okay when I set tr_TR instead of tr_TR.UTF-8

But this time result is not UTF8 formatted.

Test script:
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echo setlocale(LC_ALL, 'tr_TR.UTF-8');
echo strftime("%A %d %B %Y", mktime(0, 0, 0, 12, 22, 1978));
exit(0);


Expected result:
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Cuma 22 Şubat 1978

Actual result:
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Friday 22 December 1978