public static string ToLocalStr(TimeZoneUtil tz, DateTime dtUtc, IFormatProvider culture, string format = null)
{
// Localize the time string for user display.
// if tz == null then just label as (UTC) clearly.
var tzi = tz?.GetTimeZoneInfo();
if (tzi == null)
{
// Just label as UTC or (LOCAL)
return(dtUtc.ToDtString(format, culture) + "(UTC)");
}
return(TimeZoneInfo.ConvertTimeFromUtc(dtUtc, tzi).ToDtString(format, culture));
}
