Both the duration & countdown parsers are contained in the parser-duration.js file.
Neither parser checks for valid time settings, all it does is parse the values to make them sortable.

The duration parser will convert a duration time "####y ####d ####h ####m ####s" into a sortable value.
It is not designed to convert 365 days into 1 year, nor perform any other conversions.
Options:
- durationLabels
  - Default: '(?:years|year|y),(?:days|day|d),(?:hours|hour|h),(?:minutes|minute|min|m),(?:seconds|second|sec|s)'
  - Add more or change the duration labels by modifying this option; separate the labels with a comma.
  - The label doesn't need to include regex. If you are only using one letter, change the label to 'y,d,h,m,s'
- durationLength
  - Default: 4
  - Modify this value so that the max length of values is included.
  - The default value of 4 will include values up to 9,999
  - Values less than or equal to 99,999 will require this option to be set to 5
  - Values less than or equal to 999,999 need this value set to 6, etc.

The countdown parser will convert a countdown time "####:####:####" into a sortable value.
It is not designed to deal with invalid times like 65:99 (65 minutes & 99 seconds).
This parser also uses the durantionLength value to set the maximum length of each value used in the countdown.
- Default: 4
- Modify this value so that the max length of values is included.
- The default value of 4 will include values up to 9,999
- Values less than or equal to 99,999 will require this option to be set to 5
- Values less than or equal to 999,999 need this value set to 6, etc.

Demo

parsed values within the column

tablesorter