@crossingthethreshold Good question! But unfortunately I don’t know; I simply made a note of the date in my journal at the time. But you might also want to check your email archives for the automated “welcome” messages you’d have received upon signing up. (@manton: Having our sign-up date appear somewhere in our account settings could be nice...)
@rnv Unfortunately I don’t have that email address anymore, moving away from gmail. I had considered archiving the emails, but decided not to. I could possibly guesstimate if I looked back through my posts and can figure out where imported posts end and new, Micro.blog posts start.
@jean Thank you for the suggestion and reminder. I had images of having to go back through pages of posts. I had forgotten about the Archive.
…Looking back, I did not actually write a saying that something like, “this is my first Micro.blog post," but I think I can see where imported posts ended and MB posts started - The first week of October 2018.