misc-utils-of-mine-generic/src/time/format.ts

Miscellaneous utilities for JavaScript/TypeScript that I often use

export function formatDate(date: Date, format: 'YYYY-MM-DD' | 'MM/DD/YYYY'): string {
  if (typeof date === 'string') {
    // happens when serializing dates to json for testing
    date = new Date(date)
  }
  var dd: any = date.getDay()
  var mm: any = date.getMonth() + 1 //January is 0!
  var yyyy = date.getFullYear()
  if (dd < 10) {
    dd = '0' + dd
  }
  if (mm < 10) {
    mm = '0' + mm
  }
  if (format === 'YYYY-MM-DD') {
    return yyyy + '-' + mm + '-' + dd
  } else {
    return `${mm}/${dd}/${yyyy}`
  }
}

export function formatDateTime(date: Date, format: 'YYYY-MM-DDTHH:MMZ'): string {
  if (typeof date === 'string') {
    // happens when serializing dates to json for testing
    date = new Date(date)
  }
  let hh = `${date.getHours()}`.length < 2 ? `0${date.getHours()}` : `${date.getHours()}`
  let mm = `${date.getMinutes()}`.length < 2 ? `0${date.getMinutes()}` : `${date.getMinutes()}`
  return `${formatDate(date, 'YYYY-MM-DD')}T${hh}:${mm}`
}

/** formats date to YYYY-MM-DD HH:mm:ss, compatible with sql dates */
export function formatDateTimeForSql(date: Date): any {
  if (typeof date === 'string') {
    // happens when serializing dates to json for testing
    date = new Date(date)
  }
  let hh = `${date.getHours()}`.length < 2 ? `0${date.getHours()}` : `${date.getHours()}`
  let mm = `${date.getMinutes()}`.length < 2 ? `0${date.getMinutes()}` : `${date.getMinutes()}`
  let ss = `${date.getSeconds()}`.length < 2 ? `0${date.getSeconds()}` : `${date.getSeconds()}`
  return `${formatDate(date, 'YYYY-MM-DD')} ${hh}:${mm}:${ss}`
}

/**
 * shirks Date.now number to N digits so is better for filenames. respect date order and  milliseconds
 */
export function timeHash(digits = 36) {
  return Date.now().toString(digits)
}