DayTime 1.3 Question & Answer    
DayTime animation of Salah times for one year at Mecca

Sunset at São Luis
DayTime New Features

What is New in This Version?
In DayTime 1.3.184, the new features are:

  • DayTime (when Location:Auto is chosen) now uses your exact location (rather than that of the nearest location in its database) for all calculations, to provide the most accurate times possible. DayTime displays it's nearest location and uses it for it's automatic time zone.
    Because of this change, Current Location in the manual locations list is no longer needed and has been removed.
  • Show coordinates of the current automatic location or manually chosen location by tapping the location displayed at the top of the screen.
  • Change between 12h and 24h time by tapping the time display (in the center of the time, as shown at left).
  • Time formats for Japanese, Chinese, and Arabic.
  • Bug fixes; please see below.

DayTime Free Features

Which DayTime features are free?

  • Elegant clock showing sun position for hour.
  • Large digital time display in 12h or 24h format.
  • View time remaining until sunset (or sunrise) on the clock face which shows day length, position of sunrise and sunset time, and current sun position. DayTime helps you plan and complete your daylight activity (traveling, flying, hiking, boating, construction, etc).
  • Works worldwide, including above the (ant)arctic circle, with periods of 24-hour daylight!
  • Location and time zone found automatically and updated as you travel. Display geocoordinates by touching location.
  • Optionally choose location manually from over 1500 locations. See day length at your travel destination or if it is a good time to call your distant colleague.
  • Optionally choose GMT/Zulu or any time zone manually.
  • Simulate day length and 'event' times for any day in the future or past, eg to plan an event around the sunset time.
  • See the change in day length over the year for any location by viewing a "time-lapse" animation.
  • Show Qibla for the current selected location.

in-App Purchase Features

What in-App Purchases Are Available for DayTime?

You can make in-App Purchases à la carte, or you can purchase them together for a discounted price. "All Features, Forever" includes any in-App purchases in the future.
In-App Purchases include:

Each of the above include:
  • Exact Event Time Display on Clock Face
  • Alarms Before or After Any Event
Also available are
  • Alarms at a Fixed Time

DayTime Concept

How do I tell time?

  • The option Display Settings > Time can show or hide digital time.
  • Imagine you are facing south. Like an hour hand, the Sun moves continuously around the circle representing its 24-hour path through a day. As it moves, its long ‘minute ray’ moves like a minute hand, so when the minute ray is in the 12 o’clock position it is the top of the hour, when the minute ray is at the 6 o’clock position, it is half-past the hour, etc. The pulsing sunbeams pulse every two seconds, and they also mark positions of the clock (5, 10, 15, 20 minutes, etc) so that it is easier to read the minute ray.

Equation of Time Graph

Why does the hour ring not have 12 at the top?
There are three reasons:

  • First, if daylight saving time is in effect, the hour ring is shifted one hour counterclockwise.
  • Second, unless the location is in the very center of its (solar) timezone, the hour ring will be offset due to that location's longitude.
  • Third, because the earth’s orbit is elliptical, and that orbit is at an angle to the earth’s equator, that angle changes as the earth moves in it's orbit and so the sun's apparent position from earth also moves.
    The US Naval Observatory graph at left shows the effect of this on solar noon in minutes ahead or behind. For more information see Equation of Time.

Choosing Time Zone Manually

The hour seems wrong. What is happening?
When using automatic location with Location: Auto, time zone information is taken from the nearest location in DayTime's database to the present location. In some cases the nearest location may be in a different time zone. (Or, the time zone information that DayTime is using is incorrect.) In this case, please turn off Time Zone: Auto and choose the correct time zone.

(Note: time zone and daylight saving time information can change. Please kindly let us know if a location's information is not correct.)

Location Unavailable

DayTime only shows Location Unavailable. What is wrong?
First, try opening a map app to see if Location Services are working.
If not, please power off your device (hold power button and slide red button to power off) and then turn it back on. On rare occasions Location Services need to be reset in this manner.

If this does not work, one option is to select your location manually.

If you continue to have trouble, please contact us so we can assist you.

GPS/Location Services

How do I use GPS/Location Services to find location?
Location: Auto chooses the nearest location automatically and updates it as you travel.

With Location:Auto, DayTime always uses your exact location provided by Location Services when calculating sunrise, sunset etc. times.

For Location:Auto, DayTime chooses time zone information from its nearest known location. Because the nearest location may be in another time zone, the selected time zone may be incorrect in a few cases. Time zone can be set manually if this occurs.

Choosing Location Manually

How do I manually choose a location in the list?
Locations are grouped by internet country code: au=Australia, br=Brazil, ca=Canada, de=Germany, es=Spain, fr=France, id=Indonesia, in=India, jp=Japan, kr=Korea, mx=Mexico, ru=Russia, sa=Saudi Arabia, tr=Turkey, uk=United Kingdom, us=United States, etc.
(Link to List of ISO Country Codes)

My location isn't listed. How did you choose them?
Cities were chosen based on geographic diversity, population, etc.  Note, the important information to DayTime is latitude and longitude, time zone and daylight saving time. If a specific location is not listed, please use Location: Auto, or choose a nearby location, and please ensure the time zone is correct.

DayTime Animation

How does the animation of the change of day length work?

To start an animation, turn Animate! to ON. It is the last setting on the Settings page.

Animation runs at about 25 days per second, which shows the change in day length impressively. It also makes the movement of solar noon apparent, by the movement of the hour ring. This movement is a result of the earth moving along it's orbit, and is described by the Equation of Time.


What is the Dimming setting for?
AutoDim Level allows you to make the DayTime display darker so the display is better suited for the dark, for example to display DayTime on a night stand. Please remember to put the device on external power if Settings > General > AutoLock is off.

If not set at 100%, the display dims after 10 seconds.

In the event the display is too dark to see, remember the info button is on the lower right, to get back to the settings page, or simply stop and restart DayTime.

iOS 12h or 24h Setting

Why does DayTime show 24-hour (or 12-hour) time?
You can change display between 12- and 24-hour time. When first started, DayTime uses 12- or 24-hour numerals depending on your Settings for your device (in the Settings app).

If you touch the time display (in the top center of the time), the format will change.

Specifying a Different Date

How do I view a Date in the Future or Past?
Setting a date in the past or future is straightforward. Change "Date:Auto:" to off, and then tap the date to change to any date (DayTime is accurate between the years 1801CE and 2099CE).

To remind you it is using a date other than the current date, DayTime will show the date enclosed in [square brackets], and the sun will not display.

  • Viewing day length and the sunrise and sunset line for any date is free.
  • Viewing exact event times for any date is included with purchase of that type of event.

iPad Support, in Landscape

Which devices are supported?
iPhone, iPad and iPhone 5 are all supported!

Further, DayTime now has landscape view!

This image is from an iPad in landscape position.

in-App Purchase Sun Events Displayed

What is incuded with Sun Events?
Sun Events (shown at left) include:

  • Sunrise, sunset, solar noon, and midnight;
  • Civil first light (dawn), civil twilight ends;
  • Nautical first light, nautical twilight ends;
  • Astronomical first light, astronomical twilight ends.

For all the above:

  • You can display digital times on the clock face for any Sun Events, and set alarms before or after.
  • You can show event times for any day in the past or future.
If you purchase all features at once, "All Features, Forever" is offered at a discount. Any future in-App offers are included.

in-App Purchase Salah Events Displayed

What is included with Salah Times?
Salah Events (shown at left) include:

  • Fajr, Dhuhr, Asr, Maghrib, and Isha; Imsak, Sunrise, and Islamic Midnight
  • Adjust the calculations for Fajr and Isha to reflect their true timing for your location; create a custom scheme if included conventions are insufficient.
  • High latitude locations (above 48 degrees) are supported using the most accepted methods: angle-based, one seventh of night, and middle of night.
  • Display precise digital times for any Salah times
  • Set alarms for before or after any Salah times.
  • Show Salah times for any day in the past or future.
Lastly but importantly, you can locate the Kabaa with the included Qibla pointer.

Salah Times and Conventions

What Salah Times Are Provided?
Calculation of Salah times include Fajr, Dhuhr, Asr, Maghrib, and Isha. Islamic Midnight, Imsak and Sunrise are also included. Imsak can be specified as minutes before Fajr or degrees below the horizon (in the same manner as Fajr and Isha).
Please also see Can I make Salah Times More Precise?

What Calculation Conventions Are Supported?

  • Muslim World League
  • Islamic Society of North America
  • Egyptian General Authority of Survey
  • Umm al-Qura University, Makkah
  • University of Islamic Sciences, Karachi
  • Institute of Geophysics, Tehran University
  • Shia Ithna Ashari, Leva Research Institute, Qom
  • or custom settings, by setting Fajr, Isha, and Maghrib angle; and Midnight to Sunset to Fajr, or Sunset to Sunrise.

  • Asr can be set to Shafi'i, Maliki, Ja'fari, Hanbali, or Hanafi to establish a shadow length of 1 or 2 times.

Specifying a Different Date for Salah Times

How do I view Salah Times for the Future or Past?
Setting a date in the past or future is straightforward. Change "Date:Auto:" to off, and then tap the date to change to any date (DayTime is accurate between the years 1801CE and 2099CE).

To remind you it is using a date other than the current date, DayTime will show the date enclosed in [square brackets], and the sun will not display.

  • Viewing day length and the sunrise and sunset line for any date is free.
  • Viewing exact times for Salah is included with purchase of Salah Times.

Partial View of Salah Settings

Can I make Salah Times more precise?
Adjustment (earlier or later) to Fajr and Isha times can be made for local conditions based on your observations, up to 29 minutes 59 seconds earlier or later than the calculated time. For example, due to your distance from a DayTime automatic location or your elevation or surrounding geography, you may find the time a white thread becomes visible at dawn is 2 minutes, 5 seconds before the calculated time. You can then direct DayTime to subtract 2 minutes, 5 seconds from it's calculated Fajr times.

Locations at high latitudes are supported using Middle of Night, One-Seventh Rule, or Angle-Based method for Fajr and Isha during times of short night length.

Qibla Pointer

How accurate is the Qibla pointer?
DayTime uses a great-circle calculation to determine Qibla so that it's direction is accurate.

Once calculated, DayTime uses the compass in your device to provide its Qibla pointer (pictured at left). The device compass is accurate to 1 degree; if required, iOS will prompt you to make a figure-eight motion to calibrate the compass.

DayTime Display Showing Time of End of Shabbat

What Shabbat Times Are Provided?
Shabbat times include:

  • Beginning of Shabbat
  • End of Shabbat

Beginning of Shabbat is defined as Friday sundown. You can set an alarm before this event to make preparations in advance of Shabbat.
End of Shabbat is calculated as sunset time on Saturday plus 8.5 degrees (see image at left) per Halachic sources.

Any date in the past or future (DayTime is accurate between the years 1801CE and 2099CE) can be selected to view the time Shabbat starts or ends on that day.

Specifying a Different Date for Shabbat Times

How do I view Shabbat times for the Future or Past?
Setting a date in the past or future is straightforward. Change "Date:Auto:" to off, and then tap the date to change to any date (DayTime is accurate between the years 1801CE and 2099CE).

To remind you it is using a date other than the current date, DayTime will show the date enclosed in [square brackets], and the sun will not display.

  • Viewing day length and the sunrise and sunset line for any date is free.
  • Viewing exact times for Shabbat is included with purchase of Shabbat times.

Other Location

Can an alarm be set for sunset etc. at another location?

Yes—the sunrise, sunset, twilight, Salah, and Shabbat alarms —even the fixed time alarms— work for the currently selected location. DayTime must remain set to that location or it will change the alarm times to work for whichever new location it is given—keep DayTime set to the location of interest until after the desired alarm has occurred.

The alert will indicate the location for which it applies.

  • To call someone before nightfall in their location, choose their location and then set an alarm for before sunset (or set the alarm first then location; either will work).
  • Set an alarm for 9:00 in the morning for another location so you can do business at the start of the day.
  • To be notified 30 minutes before Fajr in Mecca, choose Mecca from the locations list and set a 0:30 before Fajr alarm.

Other Location

My Alarm Made No Sound. How Do I Get It To Work?

When an alarm occurs it should indeed make a sound. There are several possibilities for what you are not hearing:

  • Based on your feedback, we have added sound to alerts that occur while DayTime is running.
  • Settings such as Do Not Disturb, the sound level for your device, and the Settings > Sounds choices may cause the alarm sound to be silenced.
  • If you are having difficulties with alarms in any way, please contact us so we can find the cause of the problem, and if needed, publish an update.

Version History
Settings for DayTime 1.3

DayTime 1.3.184 (Current Version)

  • Display location coordinates by tapping location.
  • Location:Auto uses precise location for calculations, and chooses nearest location for display and time zone.
  • Choose 12/24h time display by tapping time.
  • Bug fixes (see below).

DayTime 1.3.170

DayTime 1.3.161

  • Sun Events, Salah Times, Shabbat Times
  • Exact Event Time Display on Clock Face
  • Alarms Before or After Any Event, Or at a Fixed Time
  • Manual Time Zone Option
  • Qibla Compass
  • More Locations
  • iPhone 5 and iPad Support; Landscape Display

Settings for SkySundial 1.2

SkySundial 1.244

  • Automatic Location Selection
  • Sunrise & Sunset Alarms
  • Sunrise & Sunset for Any Day
  • Animated Simulation

SkySundial 1.127

SkySundial 1.127

  • Manual Location Selection

Known Issues

  • Adjustments to Fajr and Isha apply to all locations, but should apply only to one location. If it is necessary, they must be manually reset for a new location.
  • Only at high latitudes (greater than 48 degrees), and during times of twilight all night, Imsak times based on angle will be incorrect. Fajr and Isha times will be correct for the selected high-latitude method: a temporary solution for Imsak is to use an offset of minutes rather than Imsak angle, and/or set an alarm the required amount of time before Fajr.
We apologize for these problems. A new version will be released as soon as possible.

Resolved Issues from Previous Versions (DayTime 1.3.170)
  • Fixed: Shabbat alarms for the week following the current week could ring on the wrong day. Corrected.
  • Fixed: Refresh alarms message sometimes was not cleared. Corrected.
    Alarms at the same time every day may not fire on the first day. Corrected.
  • Resolved: To address reports of alarms not sounding, a new sound unique to DayTime will now alert you whether DayTime is open or closed. Please let us know if you have any problems with alarms. We will fix them.
  • Fixed: Current Location did not update unless it was reselected. Now (when using automatic location), DayTime always uses your exact location for calculations with nearest location selected for display and for automatic time zone information. Current Location is therefore no longer needed and has been removed.
  • Resolved: Alarms for Shabbat can be set after Shabbat begins and before the end of Shabbat. This flexibility is preserved, but now alarms default to after Shabbat Ends (all other alarms default to before the event). Please take care to set 'before'(-) or 'after'(+) appropriately.

(DayTime 1.3.161)
  • Fixed: Alarms for Shabbat are set for the next two Fridays and Saturdays. There was an error that caused the alarm for the second Friday or Saturday to ring on the wrong day. Other alarm types were unaffected.
  • Fixed: Location:Auto worked properly, but Current Location did not update properly.

(SkySundial 1.244)
  • Fixed: Alarms valid for next day only—Alarms are now set for 7 days in advance, and provide a reminder when they need to be refreshed.
  • Fixed: A very few locations (eg Brazil, Salvador da Bahia) have the wrong time zone—These should be resolved. In addition to our own mistakes, time zone information can change; please let us know about any time zone issues and we will address them. A temporary solution is to select time zone manually, a new feature.

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