There is already a function called toISOString(): var date = new Date(); date.toISOString(); //”2011-12-19T15:28:46.493Z” If, somehow, you’re on a browser that doesn’t support it, I’ve got you covered: if (!Date.prototype.toISOString) { (function() { function pad(number) { var r = String(number); if (r.length === 1) { r=”0″ + r; } return r; } Date.prototype.toISOString = function() … Read more
I prefer using the dateutil library for timezone handling and generally solid date parsing. If you were to get an ISO 8601 string like: 2010-05-08T23:41:54.000Z you’d have a fun time parsing that with strptime, especially if you didn’t know up front whether or not the timezone was included. pyiso8601 has a couple of issues (check … Read more
Note to readers: Several commenters have pointed out some problems in this answer (related particularly to the first suggestion). Refer to the comments section for more information. DateTime.UtcNow.ToString(“yyyy-MM-ddTHH\\:mm\\:ss.fffffffzzz”); Using custom date-time formatting, this gives you a date similar to 2008-09-22T13:57:31.2311892-04:00. Another way is: DateTime.UtcNow.ToString(“o”); which uses the standard “round-trip” style (ISO 8601) to give you … Read more
Swift 4 • iOS 11.2.1 or later extension ISO8601DateFormatter { convenience init(_ formatOptions: Options) { self.init() self.formatOptions = formatOptions } } extension Formatter { static let iso8601withFractionalSeconds = ISO8601DateFormatter([.withInternetDateTime, .withFractionalSeconds]) } extension Date { var iso8601withFractionalSeconds: String { return Formatter.iso8601withFractionalSeconds.string(from: self) } } extension String { var iso8601withFractionalSeconds: Date? { return Formatter.iso8601withFractionalSeconds.date(from: self) } } … Read more
isoparse function from python-dateutil The python-dateutil package has dateutil.parser.isoparse to parse not only RFC 3339 datetime strings like the one in the question, but also other ISO 8601 date and time strings that don’t comply with RFC 3339 (such as ones with no UTC offset, or ones that represent only a date). >>> import dateutil.parser … Read more
Unfortunately, the time zone formats available to SimpleDateFormat (Java 6 and earlier) are not ISO 8601 compliant. SimpleDateFormat understands time zone strings like “GMT+01:00” or “+0100”, the latter according to RFC # 822. Even if Java 7 added support for time zone descriptors according to ISO 8601, SimpleDateFormat is still not able to properly parse … Read more
You didn’t set the timezone of the output date, so it’s defaulting to your systems’ timezone rather than UTC (which is what you were expecting).