Conversions

Convert to and from standard time and different types of decimal time. Edit any field and click to automatically update all the others. 

Local Standard Time:
Universal Time (GMT):
ISO 8601 Decimal Hours:
Excel for Windows PC:
Excel for MacOS:
Intl. Astronomical Union:
Two-line Element epoch:
Julian Year:
Julian Date:
Modified Julian Date:
Swatch @Time:
Unix Time:
STO Stardate:
Current Stardate:
TNG Stardate:
French Republican (Paris):
French Republican (local):
French Reformed (local):
French Rural calendar:

French Genealogy Style

This is how dates and times were written in genealogical vital records during the Revolution. To see how your birth certificate would have looked, enter the date above and look below:

Time Intervals

Decimal to Standard

1.0 d =	24 h 0 m 0 s
0.1 d =	2 h 24 m 0 s
0.01 d =	14 m 24 s
0.001 d =	1 m 26.4 s
0.000 1 d =	8.64 s
0.000 01 d =	864 ms
0.000 001 d =	86.4 ms

Standard to Decimal

24 h =	1.0 d
1 h =	0.041 6 d
30 m =	0.020 83 d
15 m =	0.010 416 d
5 m =	0.003 472 d
1 m =	0.000 694 d
1 s =	0.000 011 5740 d

Fractional Day to 24-Hour Time

0.0 = 00:00
0.1 = 02:24
0.2 = 04:48
0.3 = 07:12
0.4 = 09:36
0.5 = 12:00
0.6 = 14:24
0.7 = 16:48
0.8 = 19:12
0.9 = 21:36
1.0 = 24:00

24-Hour Time to Fractional Day

00:00 = 0.0
01:00 = 0.0416
02:00 = 0.083
03:00 = 0.125
04:00 = 0.166
05:00 = 0.2083
06:00 = 0.25
07:00 = 0.2916
08:00 = 0.33
09:00 = 0.375
10:00 = 0.416
11:00 = 0.4583
12:00 = 0.5
13:00 = 0.5416
14:00 = 0.583
15:00 = 0.625
16:00 = 0.666
17:00 = 0.7083
18:00 = 0.75
19:00 = 0.7916
20:00 = 0.83
21:00 = 0.875
22:00 = 0.916
23:00 = 0.9583
24:00 = 1.0

See conversions of Décimes & Quarters.