Change Timer widget settings (start & stop times) from code

Hi, I would like to be able to change Timer widget settings (start time & stop time) from my sketch using virtualWrite, similar to what a Time input widget allows.
For example, to change start time of a Timer widget attached to virtual pin V11 to 6:00AM and stop time to 7:00AM incl. time zone, I would like to call:

Blynk.virtualWrite(V11, 6*60*60, 7*60*60, "Europe/Prague");

(assuming values provided are seconds from midnight today).
But this does not work, nothing changes in the Blynk app.
Thank you.

Project environment:
• ESP8266
• Android 9.0
• Blynk server
• Blynk Library version: 0.6.1