Properties are accessed by their name. The component used for this is called the "property replacer" It is a generic component that allows you to merge properties from the event processed to e.g. the email subject line or a log file line. It is a central component that is used as often in the product as possible. The idea behind the property replacer is that there is often need to specify a value from the event processed.
The property replacer provides very powerful ways to acces the properties: they can not only be accessed as one full property. They can also be acceessed as substrings and even be reformatted. As such, the property replacer provides a specifc syntax to access properties:
The percent-signs ("%") indicates the start of a special sequence. The other parameters have the following meanings
FromPos and ToPos can be used to copy a substring from a lenghty property. The options allow to specify some additional formating.
Within the properties, all time is based on UTC regardless if your preferred time is UTC or localtime. So if you want to display localtime instead of UTC, you have to use the following syntax: %variable:::localtime%