insomnia/app/templating/extensions/now-extension.js

import moment from 'moment';

export default {
  name: 'now',
  displayName: 'Timestamp',
  description: 'get the current time',
  args: [
    {
      displayName: 'Timestamp Format',
      type: 'enum',
      options: [
        {displayName: 'ISO-8601', value: 'iso-8601'},
        {displayName: 'Milliseconds', value: 'millis'},
        {displayName: 'Unix', value: 'unix'},
        {displayName: 'Custom Format', value: 'custom'}
      ]
    },
    {
      help: 'moment.js format string',
      displayName: 'Custom Format Template',
      type: 'string',
      placeholder: 'MMMM Do YYYY, h:mm:ss a',
      hide: args => args[0].value !== 'custom'
    }
  ],
  run (context, dateType = 'iso-8601', formatStr = '') {
    if (typeof dateType === 'string') {
      dateType = dateType.toLowerCase();
    }

    const now = new Date();

    switch (dateType) {
      case 'millis':
      case 'ms':
        return now.getTime();
      case 'unix':
      case 'seconds':
      case 's':
        return Math.round(now.getTime() / 1000);
      case 'iso-8601':
        return now.toISOString();
      case 'custom':
        return moment(now).format(formatStr);
      default:
        throw new Error(`Invalid date type "${dateType}"`);
    }
  }
};