Usage of the .subtract() method

[atishaytoma]

What is the .subtract() method used for. 

[Ravi Gaurav]

Hi @atishaytoma 
It used as below

subtract(GlideDateTime start, GlideDateTime end)

Returns the duration difference between two specified GlideDateTime objects.

Parameters

Name	Type	Description
start	GlideDateTime	Start date object.
end	GlideDateTime	End date object.

Returns

Type	Description
GlideDuration	Duration difference between the two specified dates.

Scoped equivalent:

To use the subtract() method in a scoped application, use the corresponding scoped method: subtract().

Example

var gdt1 = new GlideDateTime("2011-08-28 09:00:00");
var gdt2 = new GlideDateTime("2011-08-31 08:00:00");
 
var dur = GlideDateTime.subtract(gdt1, gdt2); // Difference between gdt1 and gdt2
gs.info(dur.getDisplayValue());

Output

2 Days 23 Hours

[SeemaJenitT]

How we can subtract the date, weeks, months, year from the current date?

[Bert_c1]

see:

GlideDateTimeAPI subtract

for usages of 'subtract()'.