NanoVNA | Very Tiny Palmtop Vector Network Analyzer

I have a rich text document (.rtf) that has notes separated by dates. It follows the format below:

2021-4-6

Some notes

Hyperlink

More text

2021-4-5

Notes notes notes

I'd like to split the document so that there is a different file for each date with the corresponding notes saved and the date as the file name. The split command seemed close to what i wanted but it doesn't seem to be able to account for the variable amount of text and lines for each day. Would a bash script work for this? I'm new to this so forgive me if the answer is obvious. Edit: the document contains some leading spaces and blank lines.

An example input file:

2020-11-15

How to properly use a NanoVNA V2 Vector Network Analyzer (Tutorial) - YouTube - VNA NanoVNA

Impedence matching an antenna Reflection VNA vs Spectrum Analyzer? Usually impedence of 50 ohms VSWR Meter SWR - Standing Wave Ratio SWR = 1 means there is no reflected power

2020-11-11

Superheterodyne receiver - Wikipedia - A superheterodyne receiver, often shortened to superhet, is a type of radio receiver that uses frequency mixing to convert a received signal to a fixed intermediate frequency (IF) which can be more conveniently processed than the original carrier frequency. Protected Cell Unprotected Cell Logic Gates from Transistors: Transistors and Boolean Logic - YouTube -

Would be split into two files:

2020-11-15.rtf

2020-11-15

How to properly use a NanoVNA V2 Vector Network Analyzer (Tutorial) - YouTube - VNA NanoVNA

Impedence matching an antenna Reflection VNA vs Spectrum Analyzer? Usually impedence of 50 ohms VSWR Meter SWR - Standing Wave Ratio SWR = 1 means there is no reflected power

2020-11-11.rtf

2020-11-11

Superheterodyne receiver - Wikipedia - A superheterodyne receiver, often shortened to superhet, is a type of radio receiver that uses frequency mixing to convert a received signal to a fixed intermediate frequency (IF) which can be more conveniently processed than the original carrier frequency. Protected Cell Unprotected Cell Logic Gates from Transistors: Transistors and Boolean Logic - YouTube -