How to convert ticker value to datetime?

Question

I have the following values:

1465509600000

1402437600000

I tried the following:

attempt 1:

    public long? CommitmentStartDate { get; set; }

    public long? CommitmentEndDate { get; set; }

    public DateTime? CommitmentStartDateDate => new DateTime( (CommitmentStartDate != null ? (long)CommitmentStartDate: Convert.ToInt64(DateTime.MinValue)) );

    public DateTime? CommitmentEndDateDate => new DateTime(CommitmentEndDate != null ? (long)CommitmentEndDate: Convert.ToInt64(DateTime.MinValue));

This gives me the date in the worng format, i get this:

0001-01-02 16:42:30

0001-01-02 14:57:23

attempt 2:

    static readonly DateTime _unixEpoch =
         new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);

    public static DateTime DateFromTimestamp(long timestamp)
    {
        return _unixEpoch.AddSeconds(timestamp);
    }

    public long? CommitmentStartDate { get; set; }

    public long? CommitmentEndDate { get; set; }

    public DateTime? CommitmentStartDateDate =>  DateFromTimestamp(CommitmentStartDate != null ? (long)CommitmentStartDate: Convert.ToInt64(DateTime.MinValue));

    public DateTime? CommitmentEndDateDate => DateFromTimestamp(CommitmentEndDate != null ? (long)CommitmentEndDate: Convert.ToInt64(DateTime.MinValue));

this gave me an argumentOutOfRange exception.

How do I do this?

EDIT:

Expected values:

2014-06-11

2016-06-10

EDIT 2:

Ticks that come from date

1402437600000 ---- > 2014-06-11

1465509600000 ---- > 2016-06-10

Answer 1

Your 2 samples are 2 years apart, taking the difference from those ticks and dividing by 2, 365, 24 and 3600 leaves 1000 so they are milliseconds.

A quick check reveals that they are indeed based on 1-1-1970 so

//return _unixEpoch.AddSeconds(timestamp);
return _unixEpoch.AddMilliSeconds(timestamp);