Some aspects of daygame and nightgame overlap. I've come to prefer daygame because there are so many more interesting options out there at that time. Not the limited 20-70 people in the bar or club only. Plus, people are not as defensive during the day. The walls that girls Put up before they go to the bar or club are not as strong. They're less prepared for an approach and it shows a level of confidence that guys who only play nightgame may not have. Finally the girls are straight-up better quality overall. I don't wanna go drinking everytime I go out with a girl.
Indirect is not the only daygame approach. In fact, I prefer Direct Game. With confidence and a smile, go up to a girl and compliment something about her you GENUINELY like! She can tell the difference. Or just start chatting about something situational. That's probably the best way to start a natural conversation. The opinion stuff can work, but I avoid it because it's often boring to me. She can see that too.
Indirect Game, like asking for the time is okay if you've got nothing to say to her, but at that point, you gotta wonder why you want to approach this girl in the first place. Indirect is a fallback for me when I'm in practice mode. Trying to get into my playful state after work so I can talk to those super cute girls I'm actually interested in.
As far as openers, I recommend becoming observant about what's happening around you if you're not already and knowing what you like in a woman (what clothing you like seeing on a woman, what kind of walk you like, hairstyles etc) and use those as the basis for your genuine compliment openers if you wanna go that direction. Otherwise, check out the area your hanging out in and talk about anything that catches your attention! Be creative and make a farkload of mistakes, cause that's the only way to learn. Most importantly enjoy yourself, have fun. Entertain yourself, not her.
Let me know if you want more expansion or if this was even what you were looking for. Hope this helped.