public String putCurrentDateTime(final String key) {
        // Already normalised, so use super.put not the local one
        return super.put(key, DateUtil.createNormalDateTimeString());
    }
Puts the current date time into the map in Stroom standard ISO 8601 format,
e.g. {@link DateUtil#createNormalDateTimeString()} using the specified key.

@return The previous value for the key.
stroom-meta/stroom-meta-api/src/main/java/stroom/meta/api/AttributeMap.java