[FEATURE] Add precise reminder times

[thecaprisun]

Is your feature request related to a problem? Please describe

Yes, I'm asking about the reminder feature. It's very hard to precisely set reminders for dates in the future since you can only set by *time in the future

Describe the solution you'd like

Ability to set a specific date and time

Describe alternatives you've considered

Manually calculating the time until the desired date is, but it's hard to do so

[thecaprisun]

i forgot the title

[electron271]

i forgot the title

[anemoijereja-eden]

This is in-progress with the planned improvements to time handling