Parsing a date string to moment

Former Member over 9 years ago

I have a date string on the format "2015-12-28T17:30:00Z". Do I need to parse this string into an options dictionary and use Gregorian.moment (options) to create moment, or is there a simpler way to do this?

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Former Member over 9 years ago +2

It's very strict and handling of timezones makes it a little clunky but it should give you an idea:

// converts rfc3339 formatted timestamp to Time::Moment (null on error) function parseISODate…

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Former Member over 9 years ago

Ok, thanks.

Former Member over 9 years ago

It's very strict and handling of timezones makes it a little clunky but it should give you an idea:

// converts rfc3339 formatted timestamp to Time::Moment (null on error)

        function parseISODate(date) {

                // assert(date instanceOf String)



                // 0123456789012345678901234

                // 2011-10-17T13:00:00-07:00

                // 2011-10-17T16:30:55.000Z

                // 2011-10-17T16:30:55Z

                if (date.length() < 20) {

                        return null;

                }



                var moment = Gregorian.moment({

                        :year   => date.substring( 0,  4).toNumber(),

                        :month  => date.substring( 5,  7).toNumber(),

                        :day    => date.substring( 8, 10).toNumber(),

                        :hour   => date.substring(11, 13).toNumber(),

                        :minute => date.substring(14, 16).toNumber(),

                        :second => date.substring(17, 19).toNumber()

                });

                var suffix = date.substring(19, date.length());



                // skip over to time zone

                var tz = 0;

                if (suffix.substring(tz, tz + 1).equals(".")) {

                        while (tz < suffix.length()) {

                                var first = suffix.substring(tz, tz + 1);

                                if ("-+Z".find(first) != null) {

                                        break;

                                }

                                tz++;

                        }

                }



                if (tz >= suffix.length()) {

                        // no timezone given

                        return null;

                }

                var tzOffset = 0;

                if (!suffix.substring(tz, tz + 1).equals("Z")) {

                        // +HH:MM

                        if (suffix.length() - tz < 6) {

                                return null;

                        }

                        tzOffset  = suffix.substring(tz + 1, tz + 3).toNumber() * Gregorian.SECONDS_PER_HOUR;

                        tzOffset += suffix.substring(tz + 4, tz + 6).toNumber() * Gregorian.SECONDS_PER_MINUTE;



                        var sign = suffix.substring(tz, tz + 1);

                        if (sign.equals("+")) {

                                tzOffset = -tzOffset;

                        } else if (sign.equals("-") && tzOffset == 0) {

                                // -00:00 denotes unknown timezone

                                return null;

                        }

                }

                return moment.add(new Time.Duration(tzOffset));

        }

Former Member over 9 years ago

Thanks. Seems like a solid implementation for handling timezones.