UTC

Engineering 🇬🇧
Reinier Geers
2020-09-07
2020-09-07

  • Reinier Geers - 2020-09-07

    with SysTimeRtcConvertDateToUtc and SysTimeRtcConvertUtcToDate i can convert a date to dayofyear ( wYday ). but how can i change wYday back to date ?

     

  • i-campbell

    i-campbell - 2020-09-07

    I couldn't find an inbuilt function, but..

    PROGRAM PLC_PRG
VAR
    lastNewYearsEve : SysTimeRtc.SYSTIMEDATE := (wYear := 2019, wMonth := 12, wDay := 31);
    wYear: WORD := 2020;
    wYday: WORD := 1;
    dDate: Date;
    dwLastNewYearsEve: DWORD;
END_VAR

lastNewYearsEve.wYear := wYear - 1;
wYday := MAX(MIN(366,wYday),1);
SysTimeRtc.SysTimeRtcConvertDateToUtc(lastNewYearsEve,dwLastNewYearsEve);
dDate := TO_DATE(dwLastNewYearsEve + wYday * 60*60*24);
     

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