# Compare time now against time as a varible
**URL:** https://discourse.nodered.org/t/compare-time-now-against-time-as-a-varible/70435
**Category:** General
**Created:** [11 November 2022 10:26 UTC](https://discourse.nodered.org/t/compare-time-now-against-time-as-a-varible/70435 "2022-11-11T10:26:48Z")
**Posts on this page:** 17
**Page:** 1
### Author:  [@gazzaman22](https://discourse.nodered.org/u/gazzaman22)
#### Post date: [11 November 2022 10:26 UTC](https://discourse.nodered.org/t/compare-time-now-against-time-as-a-varible/70435/1 "2022-11-11T10:26:48Z")
Hi all im trying to compare 2 times and calculate the difference, one is from a trigger and the other is a pre-set time , I found how to check the times and get the time difference but i can work how to have a set time
Thanks
---
### Author:  [@Bobo](https://discourse.nodered.org/u/Bobo)
#### Post date: [11 November 2022 10:38 UTC](https://discourse.nodered.org/t/compare-time-now-against-time-as-a-varible/70435/2 "2022-11-11T10:38:25Z")
Have you read some doco on js dates? [JavaScript Date Set Methods](https://www.w3schools.com/js/js_date_methods_set.asp) should help you.
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### Author:  [@Colin](https://discourse.nodered.org/u/Colin)
#### Post date: [11 November 2022 11:26 UTC](https://discourse.nodered.org/t/compare-time-now-against-time-as-a-varible/70435/3 "2022-11-11T11:26:08Z")
> [@gazzaman22](#):
>
> work how to have a set time
What format is the set time in?
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### Author:  [@gazzaman22](https://discourse.nodered.org/u/gazzaman22)
#### Post date: [11 November 2022 12:02 UTC](https://discourse.nodered.org/t/compare-time-now-against-time-as-a-varible/70435/4 "2022-11-11T12:02:16Z")
I would like it to have HH:MM
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### Author:  [@gazzaman22](https://discourse.nodered.org/u/gazzaman22)
#### Post date: [11 November 2022 12:03 UTC](https://discourse.nodered.org/t/compare-time-now-against-time-as-a-varible/70435/5 "2022-11-11T12:03:02Z")
Thanks I will have a look but JavaScript is new to me
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### Author:  [@Colin](https://discourse.nodered.org/u/Colin)
#### Post date: [11 November 2022 12:19 UTC](https://discourse.nodered.org/t/compare-time-now-against-time-as-a-varible/70435/6 "2022-11-11T12:19:39Z")
What exactly are you asking? How to enter HH:MM in the dashboard? If not then what?
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### Author:  [@gazzaman22](https://discourse.nodered.org/u/gazzaman22)
#### Post date: [11 November 2022 12:36 UTC](https://discourse.nodered.org/t/compare-time-now-against-time-as-a-varible/70435/7 "2022-11-11T12:36:25Z")
Hi Colin
I what to compare real time to a fixed time and calculate the differences , I cant work out how to create the fixed time eg 10:00:00
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### Author:  [@jbudd](https://discourse.nodered.org/u/jbudd)
#### Post date: [11 November 2022 12:41 UTC](https://discourse.nodered.org/t/compare-time-now-against-time-as-a-varible/70435/8 "2022-11-11T12:41:29Z")
Do you mean (for example) "How long is it since 10 am?"
Or "How long is it since 10 am on 6th November 2022?"
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### Author:  [@gazzaman22](https://discourse.nodered.org/u/gazzaman22)
#### Post date: [11 November 2022 12:51 UTC](https://discourse.nodered.org/t/compare-time-now-against-time-as-a-varible/70435/9 "2022-11-11T12:51:41Z")
How long since 10 am
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### Author:  [@ScheepersJohan](https://discourse.nodered.org/u/ScheepersJohan)
#### Post date: [11 November 2022 13:01 UTC](https://discourse.nodered.org/t/compare-time-now-against-time-as-a-varible/70435/10 "2022-11-11T13:01:09Z")
You mean somthing like this?
```auto
let a = new Date().getHours() + 2 //the + 2 is for time zone correction
let b = 10
let c = a - b
msg.payload = c
return msg;
```
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### Author:  [@gazzaman22](https://discourse.nodered.org/u/gazzaman22)
#### Post date: [11 November 2022 13:06 UTC](https://discourse.nodered.org/t/compare-time-now-against-time-as-a-varible/70435/11 "2022-11-11T13:06:44Z")
Thanks I was try to over complicate it
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### Author:  [@jbudd](https://discourse.nodered.org/u/jbudd)
#### Post date: [11 November 2022 13:17 UTC](https://discourse.nodered.org/t/compare-time-now-against-time-as-a-varible/70435/12 "2022-11-11T13:17:14Z")
I was thinking of this approach. Probably also overcomplicated.
```auto
[
{
"id": "a8a266724d4a4895",
"type": "function",
"z": "f3e02add17e4b873",
"name": "function 18",
"func": "var now = new Date();\nvar tenam= new Date()\ntenam.setHours(10,0,0,0)\nvar diff = now.getTime() - tenam.getTime()\n\nmsg.payload = {\"now\": now, \"then\": tenam, \"difference (seconds)\": diff/1000}\n\n\nreturn msg;",
"outputs": 1,
"noerr": 0,
"initialize": "",
"finalize": "",
"libs": [],
"x": 730,
"y": 60,
"wires": [
[
"f7b3c244cbcdaf95"
]
]
}
]
```
---
### Author:  [@gazzaman22](https://discourse.nodered.org/u/gazzaman22)
#### Post date: [11 November 2022 14:04 UTC](https://discourse.nodered.org/t/compare-time-now-against-time-as-a-varible/70435/13 "2022-11-11T14:04:33Z")
thanks for the suggestion
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### Author:  [@ScheepersJohan](https://discourse.nodered.org/u/ScheepersJohan)
#### Post date: [11 November 2022 14:15 UTC](https://discourse.nodered.org/t/compare-time-now-against-time-as-a-varible/70435/14 "2022-11-11T14:15:32Z")
Just bear in mind that 'new Date()' is z time.
When you 'tenam.setHours(12,0,0,0)' you have to add time zone. I am at +2
```auto
{"now":"2022-11-11T14:13:08.881Z","then":"2022-11-11T10:00:00.000Z","difference (seconds)":15188.881}
```
---
### Author:  [@gazzaman22](https://discourse.nodered.org/u/gazzaman22)
#### Post date: [11 November 2022 14:28 UTC](https://discourse.nodered.org/t/compare-time-now-against-time-as-a-varible/70435/15 "2022-11-11T14:28:04Z")
Thanks I did spot tha,t Im in the UK so I have removed it.
Is there a way of getting to adjust for daylight saving
---
### Author:  [@ScheepersJohan](https://discourse.nodered.org/u/ScheepersJohan)
#### Post date: [11 November 2022 14:34 UTC](https://discourse.nodered.org/t/compare-time-now-against-time-as-a-varible/70435/16 "2022-11-11T14:34:34Z")
Yes with a if statement, check if it is between the certain two dates you change the value of 'tenam.setHours(12,0,0,0)'
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### Author:  [@system](https://discourse.nodered.org/u/system)
#### Post date: [25 November 2022 14:35 UTC](https://discourse.nodered.org/t/compare-time-now-against-time-as-a-varible/70435/17 "2022-11-25T14:35:06Z")
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