c# - How to Convert a Time to local Time in Different TimeZone -


currently working on chat project many users can communicate through each other sitting across globe. ie: different timezone. eg. 1st in india 2nd in america 3rd in russia 4th in australia

i saving message sent time database datetime.now.touniversaltime() issue getting if user sent message gets correct time 1 min ago rest time 4 hours ago . every person sitting across different countries should 1 min ago using javascript timezone like

 var offset = new date().gettimezoneoffset();  $("#timezoneoffset").val(offset); //setting timezone in hidden field , save cookie.

to convert utc time database show client time difference :

var timeoffset = request.cookies["timeoffset"].value; datetime dt = convert.todatetime("2015-06-15 12:13:12"); if (timeoffset != null) {     var offset = int.parse(timeoffset.tostring());     dt = dt.addminutes(-1 * offset);     model.sentdate = formattime.timeago(dt); }

this message sent india above time, seconds ago partner sitting in north america gets 4 hours ago.

what doing wrong? code convert datetime in ago format is: 

public static string timeago(datetime dt) {     timespan span = datetime.now - dt;     if (span.days > 365)     {         int years = (span.days / 365);         if (span.days % 365 != 0)             years += 1;         return string.format("about {0} {1} ago",         years, years == 1 ? "year" : "years");     }     if (span.days > 30)     {         int months = (span.days / 30);         if (span.days % 31 != 0)             months += 1;         return string.format("about {0} {1} ago",         months, months == 1 ? "month" : "months");     }     if (span.days > 0)         return string.format("about {0} {1} ago",         span.days, span.days == 1 ? "day" : "days");     if (span.hours > 0)         return string.format("about {0} {1} ago",         span.hours, span.hours == 1 ? "hour" : "hours");     if (span.minutes > 0)         return string.format("about {0} {1} ago",         span.minutes, span.minutes == 1 ? "minute" : "minutes");     if (span.seconds > 5)         return string.format("about {0} seconds ago", span.seconds);     if (span.seconds <= 5)         return "just now";     return string.empty; }

the main problem see code first line in timeago() method: datetime dt object pass method local time clients, use server local time datetime.now calculate timespan.

pass utc timestamps db method directly , replace datetime.now datetime.utcnow.


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