Timers: absolute vs relative

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Hi

I am dabbling with timers, but I am a bit confused by the documentation.

The documentation for schedule-timer says "Schedules a timer to expire at a
given time *after the start of the program*."
The one for schedule-timer-relative says "Schedules a timer to expire at a
given time after this function is called."

While the "relative" form is rather clear and intuitive (get the current
time schedule to timer x seconds later), I am a bit at a loss for the
absolute version.  How exactly do you get the "start of the program"?

Shall I just use the relative version?

Thanks

-- 
Marco Antoniotti, Professor, Director         tel. +39 - 02 64 48 79 01
DISCo, University of Milan-Bicocca U14 2043   http://dcb.disco.unimib.it
Viale Sarca 336
I-20126 Milan (MI) ITALY

REGAINS: https://regains.disco.unimib.it/

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<div dir=3D"ltr"><div>Hi<br><br></div><div>I am dabbling with timers, but I=
 am a bit confused by the documentation.</div><div><br></div><div>The docum=
entation for <span style=3D"font-family:monospace">schedule-timer</span> sa=
ys &quot;Schedules a timer to expire at a given time <b>after the start of =
the program</b>.&quot;</div><div>The one for <span style=3D"font-family:mon=
ospace">schedule-timer-relative</span> says &quot;Schedules a timer to expi=
re at a given time after this function is called.&quot;<br><br></div><div>W=
hile the &quot;relative&quot; form is rather clear and intuitive (get the c=
urrent time schedule to timer x seconds later), I am a bit at a loss for th=
e absolute version.=C2=A0 How exactly=C2=A0do you get the &quot;start of th=
e program&quot;?<br><br></div><div>Shall I just use the relative version?</=
div><div><br></div><div>Thanks</div><br><span class=3D"gmail_signature_pref=
ix">-- </span><br><div dir=3D"ltr" class=3D"gmail_signature" data-smartmail=
=3D"gmail_signature"><div dir=3D"ltr"><div><span style=3D"font-family:monos=
pace">Marco Antoniotti, Professor, Director =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 tel. +39 - 02 64 48 79 01<br>DISCo, University of Milan-Bicocc=
a U14 2043=C2=A0=C2=A0 <a href=3D"http://dcb.disco.unimib.it" target=3D"_bl=
ank">http://dcb.disco.unimib.it</a><br>Viale Sarca 336<br>I-20126 Milan (MI=
) ITALY<br><br></span></div><span style=3D"font-family:monospace">REGAINS: =
<a href=3D"https://regains.disco.unimib.it/" target=3D"_blank">https://rega=
ins.disco.unimib.it/</a><br></span></div></div></div>

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