How to compare two Carbon Timestamps?

问题

I have two timestamps, edited_at which I created and created_at (Laravel\'s)... In database, both have type timestamp and default value 0000-00-00 00:00:00... But

var_dump(edited_at variable) is giving string. While var_dump(created_at variable) is object/Carbon. What is wrong with these timestamps?

I have to compare both after converting into integer using format(\'U\'). I can only call this method on Carbon Object. How can I do that?

回答1:

First, Eloquent automatically converts it's timestamps (created_at, updated_at) into carbon objects. You could just use updated_at to get that nice feature, or specify edited_at in your model in the $dates property:

protected $dates = ['edited_at'];

---

Now back to your actual question. Carbon has a bunch of comparison functions:

• eq() equals
• ne() not equals
• gt() greater than
• gte() greater than or equals
• lt() less than
• lte() less than or equals

Usage:

if($model->edited_at->gt($model->created_at)){
    // edited at is newer than created at
}

回答2:

Carbon has a bunch of comparison functions with mnemonic names:

• equalTo()
• notEqualTo()
• greaterThan()
• greaterThanOrEqualTo()
• lessThan()
• lessThanOrEqualTo()

Usage:

 if($model->edited_at->greaterThan($model->created_at)){
     // edited at is newer than created at
 }

Valid for nesbot/carbon 1.36.2

if you are not sure what Carbon version you are on, run this

$composer show "nesbot/carbon"

documentation: https://carbon.nesbot.com/docs/#api-comparison

回答3:

First, convert the timestamp using the built-in eloquent functionality, as described in this answer.

Then you can just use Carbon's min() or max() function for comparison. For example:

$dt1 = Carbon::create(2012, 1, 1, 0, 0, 0); $dt2 = Carbon::create(2014, 1, 30, 0, 0, 0); echo $dt1->min($dt2);

This will echo the lesser of the two dates, which in this case is $dt1.

See http://carbon.nesbot.com/docs/

回答4:

extending on @lukasgeiter answer, the methods eq(), ne(), gt(), gte(), lt(), lte() not just compare the day but it also look at the time and timezone

>> $date->toArray();

{
  "year": 2019,
  "month": 2,
  "day": 23,
  "dayOfWeek": 6,
  "dayOfYear": 53,
  "hour": 7,
  "minute": 39,
  "second": 52,
  "micro": 849616,
  "timestamp": 1550907592,
  "formatted": "2019-02-23 07:39:52",
  "timezone": {
    "timezone_type": 3,
    "timezone": "UTC"
  }
}

Time zone can be adjusted as Carbon::parse($stringDate, new DateTimeZone('Asia/Dubai'))

to compare only the day

$date1->startOfDay()->eq($date2->startOfDay())

i couldn't use these methods, hope it helps someone else.

来源：https://stackoverflow.com/questions/29684111/how-to-compare-two-carbon-timestamps