Is there any libraries or ready to use functions for easy calculating timestamps in PHP?

I need to get:

1. unixtimestamp: first second of current quarter,
2. unixtimestamp: last second of current quarter,
3. unixtimestamp: first second of previous quarter,
4. unixtimestamp: last second of previous quarter,

Problems:

• timezones,
• begining of the year in example 3) and 4)

How do You calculate that? My code looks very complicated...

CodePudding user response：

I wrote a function for you.

function getTimestampFromQuarter(string $quarterName = 'current', string $returnTimestamp = 'start', string $timezone = 'UTC', int $year = null): int {

    $dt = new DateTime();
    $dt->setTimezone(new DateTimeZone($timezone));


    // if year not defined, we use current year
    $year = $year ?? date('Y');

    // current month
    $month = date("n");

    // current quarter number
    $quarter = ceil($month / 3);

    // if we are looking for previous quarter, we have to do some math
    if (in_array(strtolower($quarterName), ['previous','last'])) {
        $quarter--;
        if (0 == $quarter) {
            $quarter = 4;
            $year--;
        }
    }

    $quarterFirstMonth = (12 / 4) * ($quarter - 1)   1; // first month of quarter
    $quarterLastMonth = (12 / 4) * ($quarter - 1)   3; // last month of quarter


    if ('start'==$returnTimestamp) {
        $dt->setDate($year, $quarterFirstMonth, 1);
        $dt->setTime(0, 0, 0);
    }
    elseif ('end'==$returnTimestamp) {

        // looking for month days count
        $ts = new DateTime();
        $ts->setDate($year, $quarterLastMonth, 1);
        $ts->setTimezone(new DateTimeZone($timezone));
        $day = date('t', $ts->getTimestamp());
        unset($ts);


        $dt->setDate($year, $quarterLastMonth, $day);
        $dt->setTime(23, 59, 59);
    }

    return $dt->getTimestamp();
}

Usage is easy:

1.. first second of current quarter:

echo getTimestampFromQuarter('current', 'start');
// output: 1633046400 (equals to Friday 1. October 2021 0:00:00)

2.. last second of current quarter:

echo getTimestampFromQuarter('current', 'end'); 
// output: 1640995199 (equals to Friday 31. December 2021 23:59:59)

3.. first second of previous quarter:

echo getTimestampFromQuarter('previous', 'start'); 
// output: 1625097600 (equals to Thursday 1. July 2021 0:00:00)

4.. last second of previous quarter:

echo getTimestampFromQuarter('previous', 'end'); 
// output: 1633046399 (equals to Thursday 30. September 2021 23:59:59)

CodePudding user response：

I gave DateTime a shot, and tried to make it easy to expand:

function getQuarterTimestamp(string $timestamp, string $returnTimestamp) : int {
    // Offset to start of current quarter
    $currentMonthQuarterOffset = - (date('n')   2) % 3;
    
    switch($timestamp) {
        case 'current':
            break;
        case 'previous':
            $currentMonthQuarterOffset -= 3; // Move back 1 quarter
            break;
        default:
            throw new InvalidArgumentException("Bad timestamp argument");
            break;
    }

    switch($returnTimestamp) {
        case 'start':
            $dayOffset = 'first';
            $timeOffset = '00:00:00';
            break;
        case 'end':
            $currentMonthQuarterOffset  = 2; // Default is start, move to end of quarter
            $dayOffset = 'last';
            $timeOffset = '23:59:59';
            break;
        default:
            throw new InvalidArgumentException("Bad returnTimestamp argument");
            break;
    }
    
    $dateTimeStr = "{$dayOffset} day of {$currentMonthQuarterOffset} month {$timeOffset}";
    
    return (new DateTime($dateTimeStr))->getTimeStamp();
}