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🕤 dateDiff() - returns a detail object about the difference between two dates
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| /** | |
| * ☃ dateDiff "Snowman Carl" (http://stackoverflow.com/questions/13903897) | |
| * Returns a detail object about the difference between two dates | |
| * | |
| * When providing custom units, provide them in descending order (eg week,day,hour; not hour,day,week) | |
| * | |
| * @param {Date} dateStart - date to compare to | |
| * @param {Date|string} [dateEnd=new Date()] - second date, can be used as unit param instead | |
| * @param {...string} [units=Object.keys(dateDiffDef)] - limits the returned object to provided keys | |
| */ | |
| export function dateDiff( | |
| dateStart: Date, | |
| dateEnd: Date | string = new Date, | |
| ...units: string[] | |
| ): { | |
| [key: string]: number | |
| } { | |
| if(typeof dateEnd === 'string') | |
| dateEnd = new Date(); | |
| let delta: number = Math.abs(dateStart.getTime() - dateEnd.getTime()); | |
| return (units.length ? units : Object.keys(dateDiffDef)) | |
| .reduce((res: object, key: string) => { | |
| if(!dateDiffDef.hasOwnProperty(key)) | |
| throw new Error('Unknown unit in dateDiff: '+key); | |
| res[key] = Math.floor(delta / dateDiffDef[key]); | |
| delta -= res[key] * dateDiffDef[key]; | |
| return res; | |
| }, {}); | |
| } | |
| // default time units for dateDiff | |
| export const dateDiffDef = { | |
| millennium: 31536000000000, | |
| century: 3153600000000, | |
| decade: 315360000000, | |
| year: 31536000000, | |
| quarter: 7776000000, | |
| month: 2592000000, | |
| week: 604800000, | |
| day: 86400000, | |
| hour: 3600000, | |
| minute: 60000, | |
| second: 1000, | |
| millisecond: 1 | |
| }; |
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