Date and time constants

32-bit dates 'DATE'

Use the DATE (D) keyword to specify dates.

Syntax:

<date keyword>#<year>-<month>-<day>
<date keyword> : DATE | date | D | d
<year>  : 1970-2106
<month> : 1-12
<day>   : 1-31

DATE literals are internally treated like the DWORD data type, which corresponds to an upper limit of DATE#2106-2-7.

Example:

PROGRAM MAIN
VAR
    dStart    : DATE := DATE#2018-8-8;
    dEnd      : DATE := D#2018-8-31;
    dCompare  : DATE := date#1996-05-06;
    bInTime   : BOOL;

    dEarliest : DATE := d#1970-1-1;      // = 0
    dLatest   : DATE := DATE#2106-2-7;   // = 4294967295
END_VAR
IF dStart < dCompare THEN
    IF dCompare < dEnd THEN
        bInTime := TRUE;
    END_IF;
END_IF

64-bit dates 'LDATE'

Use the LDATE (LD) keyword to specify dates.

Syntax:

<date keyword>#<year>-<month>-<day>
<date keyword> : LDATE | ldate | LD | ld
<year>  : 1970-2554
<month> : 1-12
<day>   : 1-31

LDATE literals are internally treated like the LWORD data type, which corresponds to an upper limit of DATE#2554-7-21.

Example:

PROGRAM MAIN
VAR
    dStart    : LDATE := LDATE#2018-8-8;
    dEnd      : LDATE := ldate#2018-8-31;
    dCompare  : LDATE := LD#1996-05-06;
    bInTime   : BOOL;

    dEarliest : LDATE := ld#1970-1-1;      // = 0
    dLatest   : LDATE := LDATE#2554-7-21;  
END_VAR
IF dStart < dCompare THEN
    IF dCompare < dEnd THEN
        bInTime := TRUE;
    END_IF;
END_IF

32-bit date and time specifications 'DATE_AND_TIME'

Use the DATE_AND_TIME (DT) keyword to specify date and time.

Syntax:

<date and time keyword>#<date and time value>

<date and time keyword> : DATE_AND_TIME | date_and_time | DT | dt
<date and time value>   : <year>-<month>-<day>-<hour>:<minute>:<second>
<year>   : 1970-2106
<month>  : 1-12
<day>    : 1-31
<hour>   : 0-24
<minute> : 0-59
<second> : 0-59

DATE_AND_TIME literals are internally handled as DWORD data type. The time is processed in seconds and can therefore take values from January 1, 1970 00:00 to February 07, 2106 6:28:15.

Example:

PROGRAM MAIN
VAR
    dtDate0    : DATE_AND_TIME := DATE_AND_TIME#1996-05-06-15:36:30;
    dtDate1    : DATE_AND_TIME := DT#1972-03-29-00:00:00;
    dtDate2    : DT            := DT#2018-08-08-13:33:20.5;

    dtEarliest : DATE_AND_TIME := DATE_AND_TIME#1979-1-1-00:00:00;    // 0
    dtLatest   : DATE_AND_TIME := DATE_AND_TIME#2106-2-7-6:28:15;     // 4294967295
END_VAR

64-bit date and time specifications 'LDATE_AND_TIME'

Use the LDATE_AND_TIME (LDT) keyword to specify date and time.

Syntax:

<date and time keyword>#<long date and time value>

<date and time keyword> : LDATE_AND_TIME | ldate_and_time | LDT | ldt
<date and time value>   : <year>-<month>-<day>-<hour>:<minute>:<second>
<year>   : 1970-2554
<month>  : 1-12
<day>    : 1-31
<hour>   : 0-24
<minute> : 0-59
<second> : 0-59

LDATE_AND_TIME literals are internally handled as LWORD data type. The time is processed in seconds and can therefore have values from January 1, 1970 00:00 to July 21, 2554 23:59:59.999999999.

Sample:

PROGRAM MAIN
VAR
    dtDate0    : LDATE_AND_TIME := LDATE_AND_TIME#1996-05-06-15:36:30;
    dtDate1    : LDATE_AND_TIME := LDT#1972-03-29-00:00:00;
    dtDate2    : LDT            := LDT#2018-08-08-13:33:20.5;

    dtEarliest : LDATE_AND_TIME := LDT#1979-1-1-00:00:00;    // 0
    dtLatest   : LDATE_AND_TIME := LDT#2554-7-21-23:59:59;   
END_VAR

32-bit dates 'TIME_OF_DAY

Use the TIME_OF_DAY (TOD) keyword to specify time.

Syntax:

<time keyword>#<time value>
<time keyword> : TIME_OF_DAY | time_of_day | TOD | tod
<time value>   : <hour>:<minute>:<second>
<hour>   : 0-23
<minute> : 0-59
<second> : 0.000-59.999

You can also specify fractions of a second in seconds. TIME_OF_DAY literals are internally treated as DWORD and thus the value is resolved in milliseconds.

Sample:

PROGRAM MAIN
VAR
    tdClockTime0 : TIME_OF_DAY := TIME_OF_DAY#15:36:30.123;
    tdClockTime1 : TOD         := TOD#12:34:56.789;

    tdEarliest   : TIME_OF_DAY := TIME_OF_DAY#0:0:0.000;
    tdLatest     : TIME_OF_DAY := TIME_OF_DAY#23:59:59.999;
END_VAR

64-bit dates 'LTIME_OF_DAY

Use the keyword LTIME_OF_DAY (LTOD) to specify the time.

Syntax:

<time keyword>#<time value>
<time keyword> : LTIME_OF_DAY | ltime_of_day | LTOD | ltod
<time value>   : <hour>:<minute>:<second>
<hour>   : 0-23
<minute> : 0-59
<second> : 0.000-59.999999999

You can also specify fractions of a second in seconds. LTIME_OF_DAY literals are internally treated as LWORD, thus the value is resolved in nanoseconds.

Example:

PROGRAM MAIN
VAR
    tdClockTime0 : LTIME_OF_DAY := LTIME_OF_DAY#15:36:30.123;
    tdClockTime1 : LTOD         := LTOD#12:34:56.7890123456;

    tdEarliest   : LTIME_OF_DAY := LTIME_OF_DAY#0:0:0.000;
    tdLatest     : LTIME_OF_DAY := LTIME_OF_DAY#23:59:59.999999999;
END_VAR

See also: