RTC Clock

[Seekur]

Hello I recently got a battery replaced in my Pokémon emerald gba cart. I was going to modify the save but I noticed an option called RTC clock. Does anyone know what it does? Here’s what my clock looks like in PKHex. Should I change anything? I’m worried the time might be messed up after changing the battery after so many years like berries growing. Can someone also tell me what “initial time” and “elapsed time” are?

Edited January 31, 2020 by Seekur