In the context of GMT the importance of time to establishing longitude and the Longitude act[0] seem much more relevant to me. I still think it's a bit of a stretch from that to "created time" though!

Whoever came up with the sundial first would have the claim to having invented time - and the sun's not out often enough in Blighty for them to be a contender :P

[0] https://en.wikipedia.org/wiki/Longitude_Act