CleanAuLait48 MVVM Framework for .NET Framework 4.8

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using System;

namespace CleanAuLait48.Core.Time
{
    public static class DateTimeHelper
    {
        private static readonly DateTime UNIX_EPOCH = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);

        private static readonly TimeZoneInfo TZ_JST = TimeZoneInfo.FindSystemTimeZoneById("Tokyo Standard Time");

        public static DateTime JstNow => TimeZoneInfo.ConvertTimeFromUtc(DateTime.UtcNow, TZ_JST);

#if NET7_0
        public static long ToUnixTime(DateTime time) => (long)((time - UNIX_EPOCH).TotalSeconds) * 1000000 + time.Microsecond;
#else
        public static long ToUnixTime(DateTime time)
        {
            return (long) ((time - UNIX_EPOCH).TotalSeconds) * 1000000 + long.Parse(time.ToString("ffffff"));
        }
#endif
    }
}