Panasonic AVCHD MTS to MP4, with file Create/Modified Date + Metadata

[stevebor1]

I would like to convert all my home videos to a more usable .mp4 format and am looking for a proper ffmpeg command to do the job.
The video was captured using a Panasonic HDC-TM90 camcorder using the HA1920 recording mode.

I would also want to make sure that the File and Media information gets copied over, specifically
Date/Time Original and possibly File Modification Date/Time (this file seems a bit odd as it was record in Germany, but my home zone is California. times are the same but offset is different)

The recording time should be copied to the appropriate file and metadata fields, maybe what the Windows/OS and apps like Plex use to filter/sort on.
(Read using Exiftool)
File Modification Date/Time
Create Date ?
Modify Date ?
Media Create Date
Media Modify Date

Not sure if necessary or beneficial to also go from 60i to 30p.

Any help would be great!

Sample File:

Input #0, mpegts, from '00066.MTS':
  Duration: 00:00:06.53, start: 0.564800, bitrate: 17280 kb/s
  Program 1
    Stream #0:0[0x1011]: Video: h264 (High) (HDMV / 0x564D4448), yuv420p, 1920x1
080 [SAR 1:1 DAR 16:9], 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
    Stream #0:1[0x1100]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, stereo, fltp,
 256 kb/s
    Stream #0:2[0x1200]: Subtitle: hdmv_pgs_subtitle ([144][0][0][0] / 0x0090),
1920x1080

Requirements:

[Jamaika]

In the mp4 container can be changed only the Track PGS(SUP) on MOV_TEXT(SRT) ex. SupRip 1.16. There is no software to support NonRealTimeMeta.
It is better to do it in container Matroska(MKV).
mkvmerge.exe --forced-track "0:no" --display-dimensions "0:1920x1080" --default-duration "0:50i" --language "1:ger" --forced-track "1:no" --forced-track "2:no" "-a" "1" "-d" "0" "-s" "2" "-T" --no-global-tags --no-chapters "(" "00066.MTS" ")" --track-order "0:0,0:1,0:2" -o "00066.mkv"
mkvextract.exe tracks "00066.mkv" 0:00066.h264 1:00066.ac3 2:00066.sup

PS I just wonder Why should to use. Some cameras record the GPS position and player should calculate our time zone.