How to Convert Local Time String to Utc

var localDate = parseDate('2015-12-04 19:05:48 CDT'); // With or without CDT (still works)
document.body.innerHTML  = [  '- Local Time: ' + formatDate(localDate),  '-   UTC Time: ' + formatDate(localDateToUTC(localDate))].join('\n');
function parseDate(dateString) {  var tokens = dateString.split(/[-: ]/g).slice(0, 6).map(function(token) { return parseInt(token, 10); });  tokens[1] -= 1; // Subtract 1 from month.  return newInstance(Date, tokens);}
function formatDate(date) {  function pad(val, pattern) { return (pattern + val).substr(-pattern.length); }   return date.getFullYear() + '-' + pad(date.getMonth() + 1, '00') + '-' + pad(date.getDate(), '00') + ' ' +    pad(date.getHours(), '00') + ':' + pad(date.getMinutes(), '00') + ':' + pad(date.getSeconds(), '00');}
function localDateToUTC(localDate) {  return new Date(localDate.getUTCFullYear(), localDate.getUTCMonth(), localDate.getUTCDate(),                  localDate.getUTCHours(), localDate.getUTCMinutes(), localDate.getUTCSeconds());}
function newInstance(clazz, arguments, scope) {  return new (Function.prototype.bind.apply(clazz, [scope].concat(arguments)));}

body {  font-family: monospace;  white-space: pre;}

How can i convert a python local datetime object to utc

from datetime import datetime
from datetime import timezone

# Datetime to timestamp
t = datetime.now()
due_by = t.timestamp()
# 1600261731.016313
print(due_by)

# Timestamp to datetime
due_by = datetime.fromtimestamp(due_by, tz=timezone.utc)
# 2020-09-16 13:08:51.016313+00:00
print(due_by)

How do I convert 2015-11-06T18:34:07+05:30 string to UTC DateTime object in C#

DateTime dt = DateTime.Parse("2015-11-06T18:34:07+05:30",
               CultureInfo.InvariantCulture,
               DateTimeStyles.AdjustToUniversal);

Or:

DateTime dt = DateTime.ParseExact("2015-11-06T18:34:07+05:30",
                                  "yyyy-MM-dd'T'HH:mm:ssK",
                                  CultureInfo.InvariantCulture,
                                  DateTimeStyles.AdjustToUniversal);

Or:

DateTimeOffset dto = DateTimeOffset.Parse("2015-11-06T18:34:07+05:30",
                                          CultureInfo.InvariantCulture);
DateTime dt = dto.UtcDateTime;

Or:

DateTimeOffset dto = DateTimeOffset.ParseExact("2015-11-06T18:34:07+05:30",
                                               "yyyy-MM-dd'T'HH:mm:sszzz",
                                               CultureInfo.InvariantCulture);
DateTime dt = dto.UtcDateTime;

Of course, there are also the TryParse and TryParseExact variants, if you need validation.

Personally, I'd recommend keeping it as a DateTimeOffset rather than going back to DateTime.

There's also Noda Time:

OffsetDateTimePattern pattern = OffsetDateTimePattern.ExtendedIsoPattern;
OffsetDateTime odt = pattern.Parse("2015-11-06T18:34:07+05:30").Value;
DateTimeOffset dto = odt.ToDateTimeOffset();
DateTime dt = dto.UtcDateTime;

Convert string containing date time and timezone to UTC datetime

date time string have 13:05 showing 24hours based time so HH would be used for hour instead of hh and -5:00 in date time string representing EST time zone

string dateTimeString = "14-Sep-2019 13:05 -5:00";

//local date time as per given time zone in date time string
DateTime dateTime = DateTime.ParseExact(dateTimeString, "dd-MMM-yyyy HH:mm zzz", CultureInfo.InvariantCulture);

DateTime dateTimeUTC = TimeZoneInfo.ConvertTimeBySystemTimeZoneId(dateTime, "UTC");

Converting string containing localtime into UTC in C

I think I've cracked it now, thanks to Andomar - this code does what I need and appears to work regardless of the current DST status (I changed the clock on my PC to check this):

#include <time.h>
#include <assert.h>

time_t parseLocalDate(char* date){
    struct tm cal = {0, 0, 0, 0, 0, 0, 0, 0, -1, 0, NULL};
    strptime(date, "%Y/%m/%d/%H", &cal);
    return mktime(&cal);
}

int main(int argc, char *argv[]){
 // DST is effect, Local Time = GMT+1
    assert(1251759600 == parseLocalDate("2009/09/01/00")); // Mon, 31 Aug 2009 23:00:00 GMT
    assert(1254351600 == parseLocalDate("2009/10/01/00")); // Wed, 30 Sep 2009 23:00:00 GMT
 // DST not in effect, Local Time = GMT
    assert(1257033600 == parseLocalDate("2009/11/01/00")); // Sun, 01 Nov 2009 00:00:00 GMT
}

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