Created
June 19, 2018 23:23
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JS Date Addition/Subtraction function
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function dateAdd(interval, qty, _date) { | |
if(!_date){_date = new Date();} | |
if (interval.toLowerCase() === 'd') { | |
if(qty >= 0){ | |
_date.setDate(_date.getDate() + qty); | |
} else { | |
_date.setDate(_date.getDate() - Math.abs(qty)); | |
} | |
return _date; | |
} else if (interval.toLowerCase() === 'm') { | |
if(qty >= 0){ | |
_date.setMonth(_date.getMonth() + qty); | |
console.log('>='); | |
} else { | |
_date.setMonth(_date.getMonth() - Math.abs(qty)); | |
console.log('else'); | |
} | |
return _date; | |
} else if (interval.toLowerCase() === 'y' || interval.toLowerCase() === 'yyyy') { | |
if(qty >= 0){ | |
_date.setMonth(_date.getMonth() + qty*12); | |
} else { | |
_date.setMonth(_date.getMonth() - Math.abs(qty*12)); | |
} | |
return _date; | |
} else {return NaN;} | |
} |
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