Alarm Text

I want to add a time string in the Alarm text.
I am generating a boolean tag to record a event in Alarm.
While generating the boolena tag first I am writing current PLC time in tag.
After about 500ms enabling the boolean tag. Boolean tag is put in normal refresh rate & time in highest referesh rate.
While testing i am facing the time value is not updating correctly. while checking report the time value is printed bit the value is old value not the recent value.