How to change different date formats to one required format.

[Jyoti007]

Under <Order Date>  field , there are 2 types of date format in one column 
a) one format :  DD - MM - YYYY
b) another format :  MM / DD / YYYY 

How can I change these 2 different formats into required format i.e. DD/ MM / YYYY ? 
Please help me with the script part.

Order Date	Region	Rep	Item	Units	Unit Cost	Total
01-06-2019	East	Jones	Pencil	95	1.99	189.05
1/23/2019	Central	Kivell	Binder	50	19.99	999.5
02-09-2019	Central	Jardine	Pencil	36	4.99	179.64
2/26/2019	Central	Gill	Pen	27	19.99	539.73
3/15/2019	West	Sorvino	Pencil	56	2.99	167.44
04-01-2019	East	Jones	Binder	60	4.99	299.4
4/18/2019	Central	Andrews	Pencil	75	1.99	149.25
05-05-2019	Central	Jardine	Pencil	90	4.99	449.1
5/22/2019	West	Thompson	Pencil	32	1.99	63.68
06-08-2019	East	Jones	Binder	60	8.99	539.4
6/25/2019	Central	Morgan	Pencil	90	4.99	449.1
07-12-2019	East	Howard	Binder	29	1.99	57.71
7/29/2019	East	Parent	Binder	81	19.99	1,619.19
8/15/2019	East	Jones	Pencil	35	4.99	174.65
09-01-2019	Central	Smith	Desk	2	125	250
9/18/2019	East	Jones	Pen Set	16	15.99	255.84
10-05-2019	Central	Morgan	Binder	28	8.99	251.72
10/22/2019	East	Jones	Pen	64	8.99	575.36
11-08-2019	East	Parent	Pen	15	19.99	299.85
11/25/2019	Central	Kivell	Pen Set	96	4.99	479.04
12-12-2019	Central	Smith	Pencil	67	1.29	86.43
12/29/2019	East	Parent	Pen Set	74	15.99	1,183.26
1/15/2020	Central	Gill	Binder	46	8.99	413.54
02-01-2020	Central	Smith	Binder	87	15	1,305.00
2/18/2020	East	Jones	Binder	4	4.99	19.96
03-07-2020	West	Sorvino	Binder	7	19.99	139.93
3/24/2020	Central	Jardine	Pen Set	50	4.99	249.5
04-10-2020	Central	Andrews	Pencil	66	1.99	131.34
4/27/2020	East	Howard	Pen	96	4.99	479.04
5/14/2020	Central	Gill	Pencil	53	1.29	68.37

[anat · Accepted solution]

use below conversion in script editor for Order Date:

Date(Floor(Alt(Num(DateField), Num(Date#(DateField, 'DD-MM-YYYY')), Num(Date#(DateField, 'D/M/YYYY')))), 'DD/MM/YYYY') as NewDateField