Set your iqamah times once. Let the engine keep them right all year.

Prayer (adhan) times shift a little every day as the sun moves. Instead of editing iqamah times for all 365 days, you write a few rules per prayer. The engine reads them and generates your whole calendar — keeping each iqamah on a clean, stable time and nudging it in tidy steps as the season changes.

Why rules instead of typing every day

Say your masjid prays Fajr iqamah about 20 minutes after adhan, but you like round times and never before 5:00 AM. Typing that for 365 days is painful and error-prone. As a rule, it’s three settings — and the engine handles sunrise creeping earlier in spring and later in winter for you.

• Stable & predictable — times land on clean minutes (e.g. every :00 / :15) and only change in tidy jumps, so your congregation isn’t chasing a new time daily.
• Bounded — you set the earliest and latest an iqamah may ever be, so it never drifts somewhere unreasonable.
• Seasonal — separate rules can kick in for Ramadan or when daylight saving flips, without touching your normal schedule.

The three rule types

Every prayer uses one rule type at a time. Pick the simplest one that matches how your masjid actually decides its iqamah.

The Predictive rule, field by field

A Predictive rule takes today’s prayer time, shifts it by a minimum gap, rounds it to a clean step, and then clamps it between an earliest and latest bound. Five settings control all of that:

How the engine computes an iqamah

For a normal Predictive rule (From End of Salah off), the engine runs four steps in order:

# Example: Fajr adhan today is 5:12 AM
1. Start  from the prayer time              → 5:12
2. Add    the Min Gap (20 min)              → 5:32
3. Round  UP to the Change By step (15)     → 5:45
4. Clamp  between Min 5:00 and Max 6:30     → 5:45 AM

When From End of Salah is on, it flips: the engine starts from the window’s end, subtracts the gap, and rounds down — so the iqamah sits a safe margin before sunrise or the next prayer.

Try it: Predictive rule simulator

This runs the exact rounding logic the engine uses. Change the settings and the adhan time, and watch the iqamah — and the steps behind it — update live.

Presets to try: Fajr · Dhuhr · Isha (loose) · Maghrib (from end)

Seasons & daylight saving: the Applicable setting

Each prayer can hold more than one rule. Applicable decides when a rule is in force, so you can layer a special schedule on top of your normal one:

The engine picks in this order: an active DST rule wins if daylight saving is on; otherwise your Standard rule; a Date Based rule fills in when today falls inside its window. Start and End dates can even be pinned to the daylight-saving switch using {DSTStartDate} and {DSTEndDate}.

Jumu’ah (Friday) prayers

Jumu’ah is set up on its own, separate from the five daily prayers — because Friday prayer works differently. It’s held at a fixed community time rather than derived from the sun, and many masjids hold more than one session.

Multiple sessions

You can define several Jumu’ah sessions — Jumu’ah‑I, Jumu’ah‑II, and so on — each with its own Azan and Iqamah time. Enable an extra session only if your masjid actually holds one.

What’s the same, what’s different

• Same idea, simpler. Each session still has a rule with a Type and an Applicable scope — but since Friday prayer is a set time, it’s almost always Fixed (a clock time like 1:30 PM). Predictive and Calculated aren’t the usual choice here.
• Scopes are Standard, DST, and All-Year only. Unlike the daily prayers, Jumu’ah has no Date Based option. To change Friday times for a season, edit the session directly.
• Per-session selection. The engine resolves each session on its own — so Jumu’ah‑I and Jumu’ah‑II can keep independent times.

Daylight saving

Give a session a DST variant to shift it in summer. While daylight saving is active the engine uses the DST time; otherwise it uses Standard. An All-Year time applies whenever it’s set, regardless of season.

# Jumu’ah-II moves an hour later in summer
Jumu’ah-II  Applicable: Standard   Azan: 1:15 PM   Iqamah: 1:30 PM
Jumu’ah-II  Applicable: DST        Azan: 2:15 PM   Iqamah: 2:30 PM

Recipes you can copy

Fajr — tidy, tracks sunrise, never too early

Type: Predictive     From End of Salah: Off
Min Gap: 20         Change By: 15
Min Time: 5:00 AM   Max Time: 6:30 AM
# ~20 min after adhan, rounded to :00/:15/:30/:45, clamped 5:00–6:30

Isha — a simple constant time

Type: Fixed
Time: 8:00 PM
# Same every night, regardless of adhan.

Dhuhr — a flat offset after adhan

Type: Calculated
Minutes After: 10
# Always exactly 10 minutes after the Dhuhr adhan.

Ramadan Isha — a seasonal override

Type: Fixed        Applicable: Date Based
Time: 9:30 PM     Start: 01-Mar   End: 31-Mar
# Runs only during Ramadan; your Standard Isha resumes after.

Common pitfalls

• Min/Max too tight. If Min Time and Max Time are very close, the iqamah gets pinned to a bound and stops tracking the sun. Give it room unless you truly want a near-fixed time.
• Change By of 1. Rounding to 1 minute means the time can move almost daily — the opposite of a stable schedule. Most masjids use 5, 10, or 15.
• Forgetting From End of Salah for Fajr. Fajr iqamah must land before sunrise. Turn this on so the engine rounds down toward the window’s end instead of up past it.
• A Date Based rule with no Standard rule. Date Based only covers its window. Always keep a Standard rule so the rest of the year is defined.