Blue sundial

Why so blue, Sue?

Wandering the grounds of the Galiano Inn, I came across this weathered looking sundial in one corner of the yard. The inscription around the outer edges reads:

"As tyme and houres passeth awaye
So doth this life of man decaye
As tyme can be redeemed at no cost
Bestow it well & let no houre be lost"

I guess it could be distilled down to "Use it or lose it".