![]() ![]() Example: moment(). The other formats are not so well defined and might be browser specific. Moment offers a handy way to format the date according to your needs, using the format () method: date.format(string) The string format accepts the same formats I described in the Parse a date section above. Moment Timezone handles DST rules for various time zones, so as long as you provide the correct time zone identifier ( userTimezone in your code), it will automatically handle the DST offset for you. There are generally 3 types of JavaScript date input formats: The ISO format follows a strict standard in JavaScript. ![]() You don't need to manually adjust for the DST offset. Assuming the input text is entered in terms of the users's local time: var expires moment (date). With a library like moment, I urge you to read the entirety of the documentation. format("MM/DD/YYYY h:mm A"), the resulting formatted time will already include the DST offset if DST is in effect for that particular date and time in the user's time zone. 15 Answers Sorted by: 134 This is found in the documentation. Therefore, when you format the time using. tz(userTimezone), you are converting that UTC time to the user's local time based on their time zone, including any DST adjustments if applicable. In your code snippet, when you call moment.utc("T16:35:21.453"), you are specifying a UTC time. When you use the tz() function with Moment Timezone, it takes into account the time zone's DST rules and adjusts the time accordingly. This is because the amount of time in a day, month, or year is variable. 8 Answers Sorted by: 539 Stating your time as HH will give you 24h format, and hh will give 12h format. Date math does not use a linear time scale, but rather increments or decrements the dates on the calendar. ![]() Moment Timezone does consider the DST (Daylight Saving Time) rules of the selected time zone and applies the appropriate DST offset to the formatted time. In Moment.js time math assumes a linear time scale, just incrementing or decrementing the UTC-based timestamp by the amount of the time units provided. ![]()
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