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EnumCalendarInfo and SYSTEMTIME

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  • EnumCalendarInfo and SYSTEMTIME

    The wDayOfWeek element of the SYSTEMTIME structure always equates 0 with Sunday, 1 with Monday, etc.

    EnumCalendarInfo using %CAL_SDAYNAME1/%CAL_SABBREVDAYNAME1 could be Sunday, Monday or another day depending upon locale settings.

    How can I map the %CAL_SDAYNAME1 day to the correct wDayOfWeek value? Ie. is there an API function that lets me know which day of the week corresponds to %CAL_SDAYNAME1?
    Bernard Ertl
    InterPlan Systems

  • #2
    Well, I might have been wrong.

    I found that GetLocaleInfo with %LOCALE_IFIRSTDAYOFWEEK returns a number from 0 to 6, but when I'm testing on my computer with %LOCALE_SYSTEM_DEFAULT, it's returning 6 which corresponds to %CAL_SDAYNAME7 which returns Sunday.

    Does %CAL_SDAYNAME1 always correspond to Monday?
    Bernard Ertl
    InterPlan Systems

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    • #3
      Just to clarify, I need to be able to map the day of week for a date returned from a SysDateTimePicker control (stored in a SYSTEMTIME function) to some data I've stored in an array with elements spanning %CAL_SDAYNAME1 to %CAL_SDAYNAME7.

      SYSTEMTIME (.wDayOfWeek) always uses 0 for Sunday. If EnumCalendarInfo is always using Monday for %CAL_SDAYNAME1 (offset 0), that would be fine as I could adjust the array index accordingly, but I can't seem to find any documentation stating whether that is true or not.
      Bernard Ertl
      InterPlan Systems

      Comment


      • #4
        Hi Bern,

        As you might know, I prefer to use my own Gregorian Date routines for calendar/date issues. But this is what I find in WIN32API.INC:
        Code:
        %CAL_SDAYNAME1          = &H00000007  ' native name for Monday
        %CAL_SDAYNAME2          = &H00000008  ' native name for Tuesday
        %CAL_SDAYNAME3          = &H00000009  ' native name for Wednesday
        %CAL_SDAYNAME4          = &H0000000a  ' native name for Thursday
        %CAL_SDAYNAME5          = &H0000000b  ' native name for Friday
        %CAL_SDAYNAME6          = &H0000000c  ' native name for Saturday
        %CAL_SDAYNAME7          = &H0000000d  ' native name for Sunday
        Can this be considered as valid documentation?

        Regards
        Egbert

        Egbert Zijlema, journalist and programmer (zijlema at basicguru dot eu)
        http://zijlema.basicguru.eu
        *** Opinions expressed here are not necessarily untrue ***

        Comment


        • #5
          Thanks Egbert. I found similar remarks in constant declarations for VB code on the internet, but I couldn't find anything in the MSDN documentation to confirm it. MSDN simply refers to the constants as representing "the ... day of the week". I guess I'll just run with it.
          Bernard Ertl
          InterPlan Systems

          Comment


          • #6
            Bern,

            Combined with my Greg.-library I use this (different values, but same idea, I guess):
            Code:
            %LOCALE_SDAYNAME1              = &H0000002A   ' long name for Monday
            %LOCALE_SDAYNAME2              = &H0000002B   ' long name for Tuesday
            %LOCALE_SDAYNAME3              = &H0000002C   ' long name for Wednesday
            %LOCALE_SDAYNAME4              = &H0000002D   ' long name for Thursday
            %LOCALE_SDAYNAME5              = &H0000002E   ' long name for Friday
            %LOCALE_SDAYNAME6              = &H0000002F   ' long name for Saturday
            %LOCALE_SDAYNAME7              = &H00000030   ' long name for Sunday
            This is my function:
            Code:
            ' ******************************************************************************
            ' * Function DayName - returns the locale-specific name of the day of the week *
            ' * parameters: wWeekDay: 1 = Monday ..... 7 = Sunday                          *
            ' *             dwLocale: country/language specific locale                     *
            ' *                       (defaults to %LOCALE_USER_DEFAULT if omitted or 0)   *
            ' *                                                                            *
            ' * NOTE: In Windows' SYSTEMTIME structure wDayOfWeek = 0 means Sunday         *
            ' *       This function now accepts both 0 and 7 as well for Sundays           *
            ' ******************************************************************************
            FUNCTION DayName(BYVAL wWeekDay AS WORD, OPTIONAL BYVAL dwLocale AS DWORD) AS STRING
              LOCAL szDayName AS ASCIIZ * 16, LCType AS LONG
            
              IF wWeekDay = 0 THEN wWeekday = 7                                 ' make function compatible with SYSTEMTIME's wDayOfWeek
              LCType = %LOCALE_SDAYNAME1 + wWeekDay - 1
              IF GetLocaleInfo(dwLocale, LCType, szDayName, SIZEOF(szDayName)) THEN
                FUNCTION = szDayName
              ELSE
                FUNCTION = ""
              END IF
            END FUNCTION
            Last edited by Egbert Zijlema; 3 Jun 2009, 05:10 AM.

            Egbert Zijlema, journalist and programmer (zijlema at basicguru dot eu)
            http://zijlema.basicguru.eu
            *** Opinions expressed here are not necessarily untrue ***

            Comment


            • #7
              Thanks.
              Bernard Ertl
              InterPlan Systems

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