PPSSPP Feature Request Page

[LunaMoo]

There's no option, the clutter is actually very real and annoying problem of PPSSPP UI currently, so adding new mostly useless options might not be desirable. PPSSPP always takes system time when booting the game, from then the time is preserved in game's state and will pass at it's own peace affected by all "time travel" settings like savestates or emulation running speed.

Modifying time in-game could actually be problematic since in some games it would not do anything at all since games don't have to check system time and when, they might as well do it just once then run their own timers, in others it could just break stuff since many psp games work in weird ways(~ made in Japan).
Option to set time on boot is pointless since you can do it already by changing your system time.

In the end, most importantly we have actual cheating system so there's no need to cheat by abusing weird game mechanics, if there are no cheats for some game doing what you want, just request them in code request thread or just learn how to create cheats yourself. Google is free teacher and definitely takes less time to learn than wait for someone else to do stuff only you might care about.:]