![]() ![]() Var second = secondsIndex>-1 ? dateItems : today.getSeconds() Var minute = minutesIndex>-1 ? dateItems : today.getMinutes() Var hour = hourIndex>-1 ? dateItems : today.getHours() Var day = dayIndex>-1 ? dateItems : today.getDate() Var month = monthIndex>-1 ? dateItems-1 : today.getMonth()-1 Var year = yearIndex>-1 ? dateItems : today.getFullYear() Var secondsIndex = formatItems.indexOf("ss") Var minutesIndex = formatItems.indexOf("ii") Var hourIndex = formatItems.indexOf("hh") ![]() Var yearIndex = formatItems.indexOf("yyyy") Var dayIndex = formatItems.indexOf("dd") Var monthIndex = formatItems.indexOf("mm") Var formatItems = normalizedFormat.split('-') Var normalizedFormat= format.toLowerCase().replace(//g, '-') You can also take advantage of the library Moment.js that allows parsing date with the specified time zone.įor those who are looking for a tiny and smart solution: = function(format) Note that the number of the month must be 1 less.Īlternate method - use an appropriate library: toString().įor old Internet Explorer compatibility (IE versions less than 9 do not support ISO format in Date constructor), you should split datetime string representation to it's parts and then you can use constructor using datetime parts, e.g.: new Date('2011', '04' - 1, '11', '11', '51', '00'). To display a date in user's local time, use. To parse a date as UTC, append a Z - e.g.: new Date(''). The best practice should always be to store dates as UTC and make computations as UTC. String are sometimes parsed as UTC and sometimes as localtime (based on browser vendor and version). Yes, it works, but it's not a yet PWA.The best string format for string parsing is the date ISO format together with the JavaScript Date object constructor.Įxamples of ISO format: YYYY-MM-DD or YYYY-MM-DDTHH:MM:SS.īut wait! Just using the "ISO format" doesn't work reliably by itself. You can try the fully functioning CycleTracker period tracking web app and view the web app source code on GitHub. addEventListener ( "submit", ( event ) => renderPastPeriods ( ) getElementById ( "end-date" ) // Listen to form submissions. getElementById ( "start-date" ) const endDateInputEl = document. getElementsByTagName ( "form" ) const startDateInputEl = document. ![]() Js // create constants for the form and the form controls const newPeriodFormEl = document. You are welcome to expand on the features that are covered and tailor the lesson and applications to your learning goals and application needs. This application does not contain necessary features like form validation, error checking, edit or delete functionality, etc. The goal is to teach the basics of converting a web application to a PWA. This is a beginner-level demonstration application. Populate the with an for every menstrual cycle saved in local storage.When a user comes back to our webpage with the same browser on the same device, we need to: Append the data to our saved local storageĮxisting users will have existing data in local storage.Repopulate the with the new list, one per cycle.Add the new menstrual cycle to the current list.Populate the with a single containing information about that cycleįor each subsequent form submission, we need to:.When a new user selects two dates and submits the form, we need to: ![]() The first time a user visits the page, there won't be any data. When a user visits the page, we check if they have existing data stored in local storage. ![]()
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