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date-format CodeQL Node.js CI


node.js formatting of Date objects as strings. Probably exactly the same as some other library out there.

npm install date-format


Formatting dates as strings

var format = require('date-format');
format.asString(); // defaults to ISO8601 format and current date
format.asString(new Date()); // defaults to ISO8601 format
format.asString('hh:mm:ss.SSS', new Date()); // just the time
format.asString(format.ISO8601_WITH_TZ_OFFSET_FORMAT, new Date()); // in ISO8601 with timezone


var format = require('date-format');
format(); // defaults to ISO8601 format and current date
format(new Date()); // defaults to ISO8601 format
format('hh:mm:ss.SSS', new Date()); // just the time
format(format.ISO8601_WITH_TZ_OFFSET_FORMAT, new Date()); // in ISO8601 with timezone



Format string can be anything, but the following letters will be replaced (and leading zeroes added if necessary):

  • dd – date.getDate()
  • MM – date.getMonth() + 1
  • yy – date.getFullYear().toString().substring(2, 4)
  • yyyy – date.getFullYear()
  • hh – date.getHours()
  • mm – date.getMinutes()
  • ss – date.getSeconds()
  • SSS – date.getMilliseconds()
  • O – timezone offset in ±hh:mm format (note that time will still be local if displaying offset)

Built-in formats:

  • format.ISO8601_FORMAT2017-03-14T14:10:20.391 (local time used)
  • format.ISO8601_WITH_TZ_OFFSET_FORMAT2017-03-14T14:10:20.391+11:00 (local + TZ used)
  • format.DATETIME_FORMAT14 03 2017 14:10:20.391 (local time used)
  • format.ABSOLUTETIME_FORMAT14:10:20.391 (local time used)

Parsing strings as dates

The date format library has limited ability to parse strings into dates. It can convert strings created using date format patterns (as above), but if you’re looking for anything more sophisticated than that you should probably look for a better library (momentjs does pretty much everything).

var format = require('date-format');
// pass in the format of the string as first argument
format.parse(format.ISO8601_FORMAT, '2017-03-14T14:10:20.391');
format.parse(format.ISO8601_WITH_TZ_OFFSET_FORMAT, '2017-03-14T14:10:20.391+1100');
format.parse(format.ISO8601_WITH_TZ_OFFSET_FORMAT, '2017-03-14T14:10:20.391+11:00');
format.parse(format.ISO8601_WITH_TZ_OFFSET_FORMAT, '2017-03-14T03:10:20.391Z');
// returns Date
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