Hi There Could anyone suggest a good way

[vague perch]

Sounds like you want to use the sun's elevation instead, at least until you buy some light sensors like https://www.zigbee2mqtt.io/devices/GZCGQ01LM.html

[grand flame]

Why use the sun elevation trigger or condition rather than a time offset from sunset or sunrise? Because the elevation more consistently relates to the light level than a fixed time offset. An hour before sunset is very different light levels on the longest day than the shortest day, for example.