Great idea would love to create this as well.. Maybe someone knows of calculation that could work

I am planning to implement workaround for Countdown and date/date-time arithmetic etc.
Please let me know whoever is interested and I will invite to the workspace.
Contact me at NealPatilATgmx.com (replace AT with @).

Thanks

First try for workaround is completed.
Data entry of either one date or two dates is expected - which will create external link to calculate Since and Countdown and results like the following will be delivered by clicking external link.

(1)
Welcome
Number of days since 01012015 till 12312015 = 364 days
Countdown to 01012015 from 12312015 = -364 days

(2)
Welcome
Number of days since 12312015 = -169 days
Countdown to 12312015 from today = 169 days

nealpatil - great idea, can you post more details regarding how this works?

@nealpatil I would be interested to know if you got this working?

@Matthew , @James Hayward

Contact me at NealPatilATgmx.com (replace AT with @).

I will invite to my podio workspace where you will be able to see it in action as described below.

(1)

Welcome
Today is 08162015
Number of days since 01012015 till 12312015 = 364 days
Countdown to 01012015 from 12312015 = -364 days

(2)

Welcome
Today is 08162015
Number of days since 01012015 = 227 days
Countdown to 01012015 from today = -227 days

(3)
Delivers only number for result of => Since 01012015(till today 08162015)
227

(4)
Delivers only number for result of => countdown to 01012016 (from today 08162015)
138

@Matthew,

External site calculates and delivers results.