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Phobos provides the following functionality for time:
Functionality Symbols
Points in Time Clock  Date  TimeOfDay  DateTime  SysTime 
Timezones TimeZone  UTC  LocalTime  PosixTimeZone  WindowsTimeZone  SimpleTimeZone 
Intervals and Ranges of Time Interval  PosInfInterval  NegInfInterval 
Durations of Time Duration  weeks  days  hours  minutes  seconds  msecs  usecs  hnsecs  nsecs 
Time Measurement and Benchmarking MonoTime  StopWatch  benchmark 
This functionality is separated into the following modules:
Jonathan M Davis and Kato Shoichi
Get the current time from the system clock.
import std.datetime.systime : SysTime, Clock;

SysTime currentTime = Clock.currTime();
Construct a specific point in time without timezone information and get its ISO string.
import : DateTime;

auto dt = DateTime(2018, 1, 1, 12, 30, 10);
writeln(dt.toISOString()); // "20180101T123010"
writeln(dt.toISOExtString()); // "2018-01-01T12:30:10"
Construct a specific point in time in the UTC timezone and add two days.
import std.datetime.systime : SysTime;
import std.datetime.timezone : UTC;
import core.time : days;

auto st = SysTime(DateTime(2018, 1, 1, 12, 30, 10), UTC());
writeln(st.toISOExtString()); // "2018-01-01T12:30:10Z"
st += 2.days;
writeln(st.toISOExtString()); // "2018-01-03T12:30:10Z"