Here is a script that i've done for testing the timestamp and the input.time fonction. You can see verticals lines blue and yellow.
The blue are the ECB meeting date (7 dates) The yellow are the FED meeting date. (10 Dates)
// In the parameter you can enter the next rolling month date for ECB and FED // I don't figure out how to add label / Txt on the lines // And be carreful i don't put the real hours of the meeting.