Date and Time Data Types

The data types ‎DATE‎, ‎DATE_AND_TIME‎ (‎DT‎), and ‎TIME_OF_DAY‎ (‎TOD‎) are handled internally like a ‎DWORD‎ (32-bit value).

The data types ‎LDATE‎, ‎LDATE_AND_TIME‎ (‎LDT‎), and ‎LTIME_OF_DAY‎ (‎LTOD‎) are treated internally like an ‎LWORD‎ (64-bit value).

The values of these data types are measured in seconds, milliseconds, and nanoseconds since 01/01/1970.

Data Type	Lower Limit	Upper Limit	Memory	Resolution
`‎DATE‎`	`‎DATE#1970-01-01‎` `‎D#1970-01-01‎`	`‎DATE#2106-02-07‎` `‎D#2106-02-07‎`	32-bit	Seconds (although only the day is displayed)
`‎DATE_AND_TIME‎` `‎DT‎`	`‎DATE_AND_TIME#1970-1-1-0:0:0‎` `‎DT#1970-1-1-0:0:0‎`	`‎DATE_AND_TIME#2106-02-07-06:28:15‎` `‎DT#2106-02-07-06:28:15‎`	32-bit	Seconds
`‎TIME_OF_DAY‎` `‎TOD‎`	`‎TIME_OF_DAY#0:0:0‎` `‎TOD#0:0:0‎`	`‎TIME_OF_DAY#23:59:59.999‎` `‎TOD#23:59:59.999‎`	32-bit	Milliseconds

`‎LDATE‎`	`‎LDATE#1970-1-1‎` `‎LD#1970-1-1‎`	`‎LDATE#2554-7-21‎` `‎LD#2554-7-21‎`	64 bits	Nanoseconds (although only the day is displayed)
`‎LDATE_AND_TIME‎` `‎LDT‎`	`‎LDATE_AND_TIME#1970-1-1-0:0:0‎` `‎LDT#1970-1-1-0:0:0‎`	`‎LDATE_AND_TIME#2554-7-21-23:34:33.709551615‎` `‎LDT#2554-7-21-23:34:33.709551615‎`	64 bits	Nanoseconds
`‎LTIME_OF_DAY‎` `‎LTOD‎`	`‎LTIME_OF_DAY#0:0:0‎` `‎LTOD#0:0:0‎`	`‎LTIME_OF_DAY#23:59:59.999999999‎` `‎LTOD#23:59:59.999999999‎`	64 bits	Nanoseconds

VAR
    //Date
    dateBottom : DATE :=  DATE#1970-1-1;
    dateTop : DATE :=  DATE#2106-2-7;
    dateAppointment : DATE := D#2020-2-7; // D prohibited

    //Date and time
    dtBottom : DATE_AND_TIME :=  DATE_AND_TIME#1970-1-1-0:0:0;
    dtTop : DT :=  DATE_AND_TIME#2106-02-07-06:28:15;
    dtAppointment : DT := DT#2020-2-7-12:55:1.234;

    //Time of day
    todBottom : TIME_OF_DAY :=  TIME_OF_DAY#0:0:0;
    todTop : TOD :=  TIME_OF_DAY#23:59:59.999;
    todAppointment : TOD := TOD#12:3:4.567;

    // Long date
    ldateBottom : LDATE :=  LDATE#1970-1-1;
    ldateTop : LDATE :=  LDATE#2106-2-7;
    ldateAppointment : LDATE := LD#2020-2-7; // LD prohibited

    // Long date and time
    ldtBottom : LDATE_AND_TIME :=  LDATE_AND_TIME#1970-1-1-0:0:0;
    ldtTop : LDT :=  LDATE_AND_TIME#2262-4-10-23:34:33.709551615;
    ldtAppointment : LDT := LDT#2020-2-7-12:55:1.234567891;

    //Long time of day
    ltodBottom : LTIME_OF_DAY :=  LTIME_OF_DAY#0:0:0;
    ltodTop : LTOD :=  LTIME_OF_DAY#23:59:59.999999999 ;
    ltodAppointment : LTOD := LTOD#12:3:4.567890123;

END_VAR