Description:
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I am trying to insert 14:27 value in the datetime field. I think its correct, cause in PostgreSQL manual descripted following time inputs:

Table 8.11. Time Input
Example | Description 
04:05 | ISO 8601 
040506 | ISO 8601 
.... cutted here....
04:05:06 PST | time zone specified by name 
2003-04-12 04:05:06 America/New_York | time zone specified by full name 

Only 2003-04-12 04:05:06 matches by time regexp in pg_convert.
Here the reported regexp:
'^([0-9]{4}[/-][0-9]{1,2}[/-][0-9]{1,2})([ \t]+(([0-9]{1,2}:[0-9]{1,2}){1}(:[0-9]{1,2}){0,1}(\.[0-9]+){0,1}([ \t]*([+-][0-9]{1,2}(:[0-9]{1,2}){0,1}|[a-zA-Z]{1,5})){0,1})){0,1}$'

Its realizes logic 'date and maybe time', but it's not only possible input. Also i confised by [ \t]+ , united with XX:XX part of regexp.
I think that regexp must be like that:
'^(([0-9]{4}[/-][0-9]{1,2}[/-][0-9]{1,2}){0,1}([ \t]+){0,1}(([0-9]{1,2}:[0-9]{1,2}){1}(:[0-9]{1,2}){0,1}(\.[0-9]+){0,1}([ \t]*([+-][0-9]{1,2}(:[0-9]{1,2}){0,1}|[a-zA-Z]{1,5})){0,1})){0,1}$'

Expected result:
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Inserted value in database table

Actual result:
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Notice: pg_insert() [function.pg-insert]: '15:04' does not match with '^([0-9]{4}[/-][0-9]{1,2}[/-][0-9]{1,2})([ \t]+(([0-9]{1,2}:[0-9]{1,2}){1}(:[0-9]{1,2}){0,1}(\.[0-9]+){0,1}([ \t]*([+-][0-9]{1,2}(:[0-9]{1,2}){0,1}|[a-zA-Z]{1,5})){0,1})){0,1}$' in C:\Program Files\Apache Software Foundation\Apache2.2\htdocs\data\index.php on line 226