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F_SUBPERIOD

• function from adhoc
• Compatible with UTF-8
• Input VARCHAR(254) period 1 in pattern [d]:h:m:s, VARCHAR(254) period 2 in pattern [d]:h:m:s
• Output VARCHAR(254) period 2 subtracted from period 1

Periods could be entered with 2- or 1 digits interval (dd:hh:mm:ss or d:h:m:s). Negative periods starts with a "-" in front. Periods with pattern days:hours:minutes:seconds (4 intervalls) or hours:minutes:seconds (3 intervalls) are allowed. The output of periods with less than 3 intervalls or containing other characters is <null> or empty string. For input also f.e. '0:26:0:0' instead of '1:2:0:0' alllowed for 26 hours. The output is allways in pattern days:hours:minutes:seconds (4 * 2 digit intervalls). If second input period is greater than first, the output is negativ ("-" in front).

Example

 select '00:00:54:50' as ISCORRECT, F_SUBPERIOD('0:1:10:0', '0:0:15:10')
 from RDB$DATABASE
 union
 select '-00:00:54:50' as ISCORRECT, F_SUBPERIOD('0:0:15:10', '0:1:10:0')
 from RDB$DATABASE
 union
 select null as ISCORRECT, F_SUBPERIOD(null, null)
 from RDB$DATABASE;

Expected results:

 ISCORRECT                                                                                                                                                         
 ============ =======================================================
 <null>       <null>                                                                                                                                               
 -00:00:54:50 -00:00:54:50                                                                                                                                         
 00:00:54:50  00:00:54:50 

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