How to call javascript result into ASP:textbox control

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Javascript

Hi
I have some javascript code to find the local computer date and time. because our server in US. We are in Malaysia. It will pick up the US Time. I need to store the result into mssql database table
si i need to display the result in text box control

so below code

<script type="text/javascript">
                var currentTime = new Date()
                var month = currentTime.getMonth()
                var day = currentTime.getDate()
                var year = currentTime.getFullYear()
                var hours = currentTime.getHours()
                var minutes = currentTime.getMinutes()
                var seconds = currentTime.getSeconds()
                var miliseconds = currentTime.getMilliseconds()

                if (minutes < 10) {
                    minutes = "0" + minutes
                }
                if (seconds < 10) {
                    seconds = "0" + seconds
                }
                document.write(year + "-" + month + "-" + day + " " + hours + ":" + minutes + ":" + seconds + ":" + miliseconds)
</script>

What I have tried:

Really I don't know how to do.