Transforming date and timezone offset into an isoDate format using moment.js

When retrieving data from the API, I encounter Date, Time, and Offset values in separate columns. My goal is to obtain an ISO date while maintaining the original date and time values.

const date = "2019-04-15"
const time = "13:45"
const offset = 1 // It can be negative like -4 or -5

The desired output is "2019-04-15T13:45:00+01:00", where the date, time, and offset remain unchanged.

If the offset for the same datetime is -4, then the output should be "2019-04-15T13:45:00-04:00".

To achieve this, I am using the following code:

moment(date+'T'+time).utcOffset(offset).format();

However, the current output is "2019-04-15T12:45:00+01:00" as it adjusts the time based on the offset value, which is not the desired outcome.

Answer №1

As stated in the documentation, when using the utcOffset() function, passing true as the second parameter will adjust the offset based on local time rather than universal time:

By setting it to true, the local time remains unchanged, but the corresponding Universal Time point is altered.

The necessity of utilizing this feature depends on how your original timestamp is managed. If the time is stored in UTC and the offset is calculated in relation to UTC, then this additional parameter is not required. However, if the offset is determined by the local server time, you can utilize this parameter to ensure the relative value is maintained as expected.

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