Description:
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date_parse() is expected to return false for missing values.

For example: 

    date_parse('1st Aug')['year'] === false;

As soon as you provide day of week, the hour, minute, second components magically become 0 (as in 00:00:00) even though they do not exist:

    date_parse('Sat 1st Aug')['hour'] === 0; // expected: false
    date_parse('Sat 1st Aug')['minute'] === 0; // expected: false
    date_parse('Sat 1st Aug')['second'] === 0; // expected: false


See: http://3v4l.org/HvND2

Test script:
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<?php

print_r(date_parse('Sat 1st Aug'));