Formula to pull in start/finish dates?

[rlexcel101]

Hi all struggling with figuring out how to pull in start and finish dates from a cash flow.

Say I have:

Jan 19 Feb 19 Mar 19 Apri 19..etc

$xxx. $xx



For this example..the start would be Jan and finish would be Feb.

How would I create a formula for this?

 

[sheetspread]

Excel 2010
	A	B	C	D	E	F	G	H	I	J	K	L
1	1/1/2019	2/1/2019	3/1/2019	4/1/2019	5/1/2019	6/1/2019	7/1/2019	8/1/2019	9/1/2019	10/1/2019	11/1/2019	12/1/2019
2			345				992			337
3
4	start	3/1/2019
5	finish	10/1/2019
Sheet2

Cell Formulas
Range	Formula
B5	=INDEX($A$1:$L$1,MATCH(99999999999999900,$A$2:$L$2,1))
B4	{=INDEX($A$1:$L$1,MATCH(TRUE,$A$2:$L$2<>"",0))}
Press CTRL+SHIFT+ENTER to enter array formulas.

lookup can return the end date also