Although you can cast the spell at any time when the sun is shining, I think it is perfect for a bright, clear morning in spring.
Here's what you do:
Stand facing a window through which sunlight is shining, or where you can see the sun in the sky. Strike the match and hold it in one hand, while holding the unlit tea-light candle in the other and look out of the window (do not stare directly at the sun, however, as that can harm your eyes).
Think clearly of what you wish for, then say:
All I ask on this bright sunny dayLight the candle with the match, then blow out the match and put the candle in a safe tea-light holder and let it burn right down.
Is send the wish I want my way.
For safety reasons, you shouldn't leave the candle unattended. Personally, I like to place it near me while I get on with my work or chores of the day, so that I can glance at it from time to time.
Links and previous related posts:
Pagan Portals - Candle Magic: A Witch's Guide to Spells and Rituals