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function parseNumber(s) {
return parseInt(s, 10);
}
//in seconds
var hours = 3600;
var minutes = 60;
//take date (year, month, day) and time (hour, minutes, seconds) digits in UTC
//and return a timestamp in seconds
function parseDateTimeParts(dateParts, timeParts) {
dateParts = dateParts.map(parseNumber);
timeParts = timeParts.map(parseNumber);
var year = dateParts[0];
var month = dateParts[1] - 1;
var day = dateParts[2];
var hours = timeParts[0];
var minutes = timeParts[1];
var seconds = timeParts[2];
var date = Date.UTC(year, month, day, hours, minutes, seconds, 0);
var timestamp = date / 1000;
return timestamp;
}
//parse date with "2004-09-04T23:39:06-08:00" format,
//one of the formats supported by ISO 8601, and
//convert to utc timestamp in seconds
function parseDateWithTimezoneFormat(dateTimeStr) {
var dateParts = dateTimeStr.substr(0, 10).split('-');
var timeParts = dateTimeStr.substr(11, 8).split(':');
var timezoneStr = dateTimeStr.substr(19, 6);
var timezoneParts = timezoneStr.split(':').map(parseNumber);
var timezoneOffset = (timezoneParts[0] * hours) +
(timezoneParts[1] * minutes);
var timestamp = parseDateTimeParts(dateParts, timeParts);
//minus because the timezoneOffset describes
//how much the described time is ahead of UTC
timestamp -= timezoneOffset;
if(typeof timestamp === 'number' && !isNaN(timestamp)) {
return timestamp;
}
}
//parse date with "YYYY:MM:DD hh:mm:ss" format, convert to utc timestamp in seconds
function parseDateWithSpecFormat(dateTimeStr) {
var parts = dateTimeStr.split(' '),
dateParts = parts[0].split(':'),
timeParts = parts[1].split(':');
var timestamp = parseDateTimeParts(dateParts, timeParts);
if(typeof timestamp === 'number' && !isNaN(timestamp)) {
return timestamp;
}
}
function parseExifDate(dateTimeStr) {
//some easy checks to determine two common date formats
//is the date in the standard "YYYY:MM:DD hh:mm:ss" format?
var isSpecFormat = dateTimeStr.length === 19 &&
dateTimeStr.charAt(4) === ':';
//is the date in the non-standard format,
//"2004-09-04T23:39:06-08:00" to include a timezone?
var isTimezoneFormat = dateTimeStr.length === 25 &&
dateTimeStr.charAt(10) === 'T';
var timestamp;
if(isTimezoneFormat) {
return parseDateWithTimezoneFormat(dateTimeStr);
}
else if(isSpecFormat) {
return parseDateWithSpecFormat(dateTimeStr);
}
}
module.exports = {
parseDateWithSpecFormat: parseDateWithSpecFormat,
parseDateWithTimezoneFormat: parseDateWithTimezoneFormat,
parseExifDate: parseExifDate
};