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function onTimezoneOffsetChange(changeHandler){ | |
function getTimezoneOffset(){ | |
const d = new Date() | |
return d.getTimezoneOffset() | |
} | |
function getNextHourOffset(){ | |
const d = new Date() | |
return (1000*60*60) - (((d.getMinutes()*60) + d.getSeconds()) * 1000) + d.getMilliseconds() | |
} | |
let lastTZOffset = getTimezoneOffset() | |
let timeoutRef | |
function scheduleCheck(){ | |
timeoutRef = setTimeout(function(){ | |
const tzOffset = getTimezoneOffset() | |
if(lastTZOffset !== tzOffset){ | |
lastTZOffset = tzOffset | |
changeHandler(tzOffset) | |
} | |
scheduleCheck() | |
}, getNextHourOffset()+1) // run 1ms after end of hour | |
} | |
scheduleCheck() | |
} | |
onTimezoneOffsetChange(function(tzOffset){ | |
console.log("timezone changed") | |
// location.reload() or refresh somehow | |
}) |
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