Determines whether a specified time is valid


      TimeValid( <cTime> ) --> lValid


<cTime> Designates a character string that contains the time to test.


TimeValid() RETURNs .T. when <cTime> is a valid time; or .F. when <cTime> is an invalid time.


With input that requires time manipulation, writing your own UDF to check time inputs was unavoidable up to now. TimeValid() permits Complete checking of a time designation. You can use this FUNCTION effectively with a VALID clause within a READ mask.


Note the format for time designations. There must always be two digits for hours, minutes, seconds, and hundredths; otherwise, the time it is regarded as invalid. Valid examples are “12”, “12:59”, “12:59:59”, and “12:59:59:99”. By contrast, invalid examples are “24”, “12:60”, or “12:1”, and/or “12:”. IF you work with time strings that are not completely filled and that you need to check with TimeValid(), then they must be TRIMmed prior to the use of TimeValid() (see following Examples).


      Using the VALID clause with TRIM, all valid times are
      accepted, even IF no seconds or minutes are specIFied:

      cBegin := SPACE( 11 )
      @ 5, 10 SAY "Please input time for beginning work:";
      GET cBegin VALID TimeValid( RTRIM( cBegin ) )

      Using a VALID clause without TRIM, hours and minutes must be
      specified, so that TimeValid() can confirm a valid time:

      cBegin := SPACE( 5 )
      @ 5, 10 SAY "Please input time for beginning work:";
      GET cBegin VALID TimeValid( cBegin )


This function is CA-Cl*pper Tools compatible.




Source is dattime3.c, library is libct.



2 responses to “TimeValid()

  1. Pingback: Harbour Date & Time Functions | Viva Clipper !

  2. Pingback: Harbour All Functions – T | Viva Clipper !

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