====== DateDiff ======

The DateDiff function (<DateTime>, <DateTime>, <String>) returns the difference between two DateTimes as a number and rounds, if need to, to 2 decimal digits.
The **returned value is always positive**. Possible values ​​for the "identifier" parameter are:\\ 

  * **s**: For difference in seconds
  * **min**: For difference in minutes
  * **h**: For difference in hours
  * **d**: For difference in days
  * **m**: For difference in months
  * **y**: For difference in years


==== Syntax: ====

<code>DateDiff(Date, Date, Identifier)</code>

==== Samples: ====

<code>
DateDiff('1970-01-01', ActualDateTime(),'s')
Output in Unix format, in seconds since 1970
</code>

<code>DateDiff('2017-01-01T06:00:00','2017-01-02T05:00:00','h')
return value: 23 (Hours)
</code>

<code>DateDiff('2017-01-01','2017-01-20','d')
return value: 19 (Days)
</code>

<code>DateDiff('2017-01-01','2017-05-01','m')
return value: 4 (Months)
</code>

<code>DateDiff('2017-01-01','2026-07-01','y')
return value: 9 (Years)
</code>