When does the validity of a Thai visa begin: at issue date or upon arrival?

hi does the validity counts from the issue date (approval date) or from the date of entering Thailand; or maybe I should ask - when the visa is issued does it have the begging of validity as of the moment it was issued or is that date moved forward by the embassy to be closer to departure date? let's say I applied now but flying in 2 months, I would prefer the visa starts running either from arrival in Thailand or around that date rather than from next week, if approved next week