Use the ‎LTIME_OF_DAY‎ keyword (‎LTOD‎) to specify a 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. ‎LTIME_OF_DAY‎ literals are treated internally as ‎LWORD‎ and the value is resolved in nanoseconds.

PROGRAM POU
VAR
        ltodClockTime : LTIME_OF_DAY :=  TIME_OF_DAY#15:36:30.123456789;
        todEarliest : TIME_OF_DAY := TIME_OF_DAY#0:0:0;
        todLatest : TOD := TOD#23:59:59.999999999;
END_VAR

For more information, see: ⮫ “Data Type: DATE”