I would like to suggest to change date and time format to
YYYY-MM-DD and HH-MM-SS
Due to usability in scripts for file naming, sorting and other operations.
[me@router] /system resource> :put [/system resource get uptime ] 1d08:45:37
[me@router] /system resource> /system resource print uptime: 1d8h45m43s version: 6.42.5 (stable)